This is going fast only because I already have these parts outlined... xD
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M O B I U S
~~Green Hill~~

...
Cruce: [Crosses his arms.] This Darkness is pathetic... Fun though!
Rouge: ...[Amazed.] They did it...
Celebi: Tails, you...
Tails: [Releases a sigh of relief...] Phew... So we won!
Celebi: Oh yeah! Nice work!
Tails: I feel like I got stronger too...
Lucario: You have used your ability for the first time. Now you have total control over it. Excellent work!
Tails: I can... use that whenever I want?
Rouge: Don't go getting any bad thoughts now... Erm... Especially you, Boy. [Looks at Cruce with an estranged expression.]
Cruce: As you saw, that power didn't burn everything to a crisp.
Tails: Bad thoughts? No way, I'd never hurt you guys!
Celebi: It's awesome you learned how to control some of your powers as a Pokemon! It gives us an advantage... Well, higher advantage. I mean, good lord, Cruce...
[Suddenly, a large boom is heard coming from a northeasterly direction.]
Lucario: [Immediately turns toward the direction the noise had come from.] Hm?! That can only mean one thing...
Celebi: Mewtwo... Alright guys, let's get goin'!
[They rush off in the northeastern direction as quickly as they can.]
...
...
[Suddenly, the group comes to a large promontory... The edge of the cliff has been obliterated, and there are craters in the landscape nearby, as if bombs had detonated within the ground.]
Tails: Whoa! What's happening around here?!
Lucario: [Scanning around for any sign of Mewtwo.] Where is he!? He must be up here, I sense his presence!
...
[No response from anything...]
Celebi: Mewtwo! Show yourself! We know your here!
[Tails walks to the edge of the broken cliff...]
Tails: [Scans around...] I don't see anything... [Looks down below at the waters. Immediately, he spots something blue floating above them...] Huh!? No!!
[Everyone else rushes to the cliff and looks down.]
Lucario: What is the matter?! ...Hmm...? Who is that?
Celebi: He's hurt!
Rouge: Uh-oh... Even he couldn't take out the Mewtwo thing...? We're in trouble this time... You, [Looks at Celebi.] we're gonna get him back up here.
Celebi: Got it.
Cruce: [He quickly reacts.] It's fine. I got him. [Cruce walks to the edge of the promontory, an arm raised over the sea. A black, cubical platform forms underneath the surface of the water beneath the blue hedgehog. Slowly, it rises before picking up speed and rising over the promontory. The group spreads out, forming a location for the platform to drop. Cruce, having turned around, controls the steady descent of the platform until it reaches the ground, sinking into the earth. It leaves the hedgehog on the grass gently.] (Sonic's hurt... Didn't see that coming... not at all.)
...
Tails: [Approaches him... He still seems to be unconscious.] ...No... Don't go... Don't... [A tear forms at one of his eyes and drips down his face.]
Rouge: Poor thing...
Lucario: [Clenches his fists tightly, closing his eyes.] ...He really has gone too far this time...
...
[There is silence between them...]
...
[The Mobian appears to be a blue hedgehog, with spikes that curl downwards.]
[Tails drops to the ground, laying his head on Sonic's chest in tears.]
Tails: [Crying...] Sonic...
Celebi: [Gasps.] So that's Sonic!? ... Oh man... Mewtwo really has pulled out all the stops on this one then, hasn't he...?
Lucario: ...Yes... In addition, his presence is fading... He has escaped... This one have immense effort while battling him... And this is how it turns out... Curse that Mewtwo, sticking his nose where it doesn't belong, harming others to the extreme...
Rouge: He... he can't be gone... He can't... That hedgehog's been through some crazy things. There's no way he's...
Sonic: ...[Regains a steady breath that causes Tails to lift his head in surprise...]
Tails: [Shocked.] Son--...
Sonic: [Begins coughing.] ... [Clears his throat.] ...Ahem, bleh... Ahhh... Whoa... [Opens his eyes slowly and sits up.] Sheesh, what happened?
Cruce: [Rejoins with the group, placing his hands in his jacket pockets.] He lives! ...
Tails: Sonic!!! [Leaps at Sonic and buries his face in his chest in tears of joy.]
Sonic: [Just barely avoids falling back.] Wha--whoa buddy! Hey there! ...What exactly is going on now?
Rouge: I knew you weren't gone. It wouldn't have been like you, Sonic.
Sonic: [Turns his head.] Rouge? What are you doing here?
Rouge: Let's just say I got some help dealing with this strange situation... And your little friend there? Well guess who...
Tails: [Looks up at Sonic.] I was worried, Sonic...
Sonic: Tails!? Is that you!?
Tails: Uh-huh! I know, it's strange.
Sonic: [Chuckles and pats Tails on the head.] What happened to you? You're like a little lion.
Tails: Well, it's a long story...
Celebi: So... You looked pretty banged up, what happened here?
Sonic: What happened? Well, um... I have no clue. This weird pink dude just shot out of nowhere and threw me against a wall demanding I tell him where the strongest... power thingy is. It got violent fast.
Lucario: Mewtwo, obviously.
Sonic: What? Mewtwo...? Was that the guy's name...? He sure put up a fight... I've never seen anything like it.
Rouge: I'm sure you haven't. Not very many people have the ability to top you.
Sonic: 'Guess he got away?
Lucario: Unfortunately, yes...
Sonic: 'Wonder what he wanted... Aside from that, what the heck is going on!?
Celebi: ...Something that I can't begin to describe easily... Darkness seems to be spreading across the worlds of Fantasy... All due to Naught's work for the Apocolypse...
Sonic: Wait, slow down a sec... You mind tellin' me who you two are first?
Lucario: I am Lucario.
Celebi: My name is Chris...
Sonic: ...[Notices Cruce nearby.] And you?
Cruce: Cruce.
Sonic: Cheery... So Chris? [Looks at Tails.] That's Chris...? Or did he become somethin' else just like you did?
Tails: To tell the truth, I'm not sure. Chris was like that when I saw him on the Pokémon World. Even stranger, Cruce here looks like Chris before he transformed. But... Cruce isn't a Pokémon like Chris is now.
Sonic: Pokémon... So you're a Pokémon too then?
Tails: That Mewtwo person--the guy you fought--turned me into this... He did it with a really secretive power, so you might wanna be alert...
Sonic: ...Hmmm... Alright. I'll keep my guard up for anything strange. So Chris... [Turns to Chris.] I finally get to meet you. Tails told me a lot about you.
Celebi: Likewise... I heard you're a pretty cool guy Sonic.
Sonic: Heh...
[The two stare each other off, as if they were sensing a spark of competition between each other...]
...
Cruce: (Heh, these two... I can see it in their eyes, their totally gonna try to impress Tails...)
Tails: ...Um... Sonic?
Sonic: [Turns to Tails.] Yeah?
Tails: What's that on your back?
Sonic: [Tries to look at his own back, spinning around a few times.] What? Is there something on me? A bug, a scratch? [Hears a slight crack.] Erf... [Hunches over and rests a hand on his back.] ... Ow...
Rouge: Ooh, ouch.
Celebi: [Notices a strange ring-shaped mark on Sonic's back. The color distinction is hard to catch from a distance; the ring is a lighter blue than the rest of his fur.] Hey, Tails is right. You do have something on your back. It's like... a ring... of some sort.
Sonic: A ring?
Celebi: Yeah, right in the center. Do you remember Mewtwo ever striking you in the back with any sort of tricky attack?
Sonic: Um... Well let's see. [Stands straight again and places both hands on his hips...] We were in the air, right about there... [Points at an unclear area in the sky, directly over where the cliff seemed to have been destroyed.] At that time, I think I said something like... "In time, this power of yours will fade into oblivion", and... hmm What else did he say there...?
Celebi: [Looks to Lucario.] Power into oblivion?
Lucario: I have never heard Mewtwo say anything such as that... But it could relate to his new twisted devotion.
Sonic: Hey, I remember now... [Mimics Mewtwo's voice.] "In time, this power that you possess will fade into oblivion as you use it, and further shape a new body..."
...
[No response from anyway as they think in silence.]
...
Sonic: That was my reaction too.
Rouge: Shape a new body... [Turns to Tails.] Little lion man, it could mean that transformation spell.
Tails: That's exactly what I was thinking also. Maybe Mewtwo really did afflict you with it Sonic... Just, in a whole different way... He's been changing so many people into Pokémon now.
Sonic: ...Hmm... [Walks to Chris, Lucario, and Cruce.] You three aren't from here, right?
Celebi: That's right, yeah.
Sonic: And... This power-crazy weirdo is from [points to Lucario.] your world right?
Lucario: Correct.
Sonic: How did he get here in the first place...?
Lucario: He stole the power of a friend of ours, a sacred relic known as a Time Gear, and also used his own power to travel to this world...
Sonic: [Rests his hand under his chin, in a thinking pose.] ...And what about you, Cruce?
Cruce: I... don't really have anything to do with Mewtwo or the Time Gears or anything.
Celebi: ... [Points at Cruce.] He's like that...
Cruce: [Shrugs.] Sorry.
Sonic: [Chuckles.] Heh, playing it neutral? I guess that's fine. But... how did you all get to this world from wherever you were before?
Celebi: We used the power of a spacial Pokémon known as Palkia.
Rouge: Just what exactly are you planning, Hedgehog? A way to go to this "Pokémon World"?
Sonic: I'm thinking if we send that freak back, all the problems will stop... But that might just cause more trouble for you guys. Plus, I have no clue how to get to that other world in the first place, so uh... [Spreads his arms out, confused.] ...He's here for somethin' though right?
Tails: From what I've gathered, he's here to harness more power. I don't know what for though.
[Celebi looks away in disappointment. Cruce notices this and crouches down, petting Celebi.]
Celebi: [Smiles at Cruce.]
Cruce: [Smiles back.] You worried...?
Celebi: A little, yeah...
Sonic: Harness power? That makes sense, 'cause of what he said to start that fight... But what gives off powe--... Oh boy... I know what he's after.
Tails: I know what you're thinking, Sonic... The Chaos Emeralds.
Sonic: Bingo... 'Think we should be chasing him right now?
Lucario: If you are ready to face him in conflict once again, then yes.
Sonic: I'm ready! I won't let that freak get the best of me! It's off to Angel Island!
Celebi: Wait a sec... How do we know that Mewtwo himself knows where Angel Island is? He's not familiar with this world, and hasn't the slightest idea of what the power source really is.
Tails: That's a good point. He's just gonna continue going around interrogating innocent people until they fill him in on the details, if they know about them. Eventually, this will spread to our friends too Sonic.
Sonic: ...Yeah, you're right... This isn't good... You know what we should do? We should tell this Mewtwo guy that there's a crazed doctor who knows everything about the Chaos Emeralds, and he's hiding in a big, metropolis...
Cruce: [Stands, immediately aware of who Sonic is referring to.] Dude. We should totally do that.
Tails: Sooonic, Cruuuuce...
Sonic: What? It'd be funny to see good 'ol Eggman down on his hands and knees beggin' for mercy.
Rouge: I think we should head back to Central City. You know, just in case...
Tails: Good idea, Rouge. We can't have Mewtwo harming the citizens. C'mon guys, let's hurr--wait! Cruce! How do you know about the Dr.?!
Cruce: Parallel dimensions... I've been to this world in my own universe. So everything here should exist in that world too. I've met Eggman, and I know what he's like. Hell, I've met Mewtwo too. They're not to different in this dimension, honestly.
Sonic: Okay, waaaay too complicated... But there's something I'm good at. Don't blink! [As soon as he begins to run at incredible speed, he trips, falling face first. Despite that, he is in an immobilized state and cannot seem to get up... The ring on his back begins to glow.]
Celebi: Sonic? [Flies ahead of everyone else, following behind. They gather around Sonic.]
Sonic: [Muffled through the grass.] Ohhh, oww... Sorry you had to see that...
Tails: Sonic, that ring on your back! It's glowing!
[For a couple more seconds, the strange mark continues to glow. Eventually, the glow dissipates as small sparks of energy.]
Sonic: [Slowly rises to his feet, brushing some dirt off of his thighs.] Let's... try that again. See you all back at the workshop! [Dashes off.]
Tails: No Sonic wai--[Throws out a paw and almost falls over, forgetting he has been on all fours the entire time.] ...Well, he didn't trip this time... What do you guys think that could've meant...?
Lucario: Hmm... As of now, I cannot say... Maybe this strange effect will become clear to us as time passes...
Celebi: Speaking of time, it looks like we're running out of it.
Rouge: [Stares off out at the sea now a ways back. The sun has set. Darkness suddenly envelops the area as if a light switch was flicked off.] Nightfall is already here...
Tails: C'mon, we have to catch up to Sonic in case something happens to him again! Let's go!
Cruce: Actually. Gather around me everyone. I can take us there much faster. We'll even beat Sonic.
Rogue: Hmhm, then let's.
Lucario: You have a plan, Cruce?
[They gather around him.]
Cruce: [Crosses his arms and nods.] Check it. [A dark corridor takes them all back to Tails' lab in an instant.]
...
...
~~Central City...~~
[Panic still seems to hover throughout the city like an emotional mist. There are no signs of citizens, as they are hidden away inside their homes, still terrified at this occurrence. They, too, have suffered a new form... Or gained...?]
...
[The five reappear in the lab. It's still a mess.]
Rogue: Whew. He was right... [She walks from the group, looking around.] What in the world happened in here?
Tails: [Walks to Rogue.] Uh... a little trouble...
Celebi: Cruce! [Flies up to him and sits on his head.] That was tight!
Cruce: Oh--hey! Heheh. Thanks. [Smirks.]
Lucario: I agree... what a methodical way of transportation. I will question you about this later.
Cruce: Looking forward to that, heh.
Lucario: Hmhm.
[Just then, Sonic arrives in the lab. He appears to be a bit woozy.]
Sonic: Urgh... [Dizzy, he makes his way to the desk chair, holding a hand to his head.]
Tails: Sonic! Are you... are you okay? Sonic...?
Sonic: Give me a second... Major... headache... and... everything ache... [He sits in the chair...]
...
Lucario: Sonic, there is a glow behind you. Is that the mark?
Sonic: Urf, it burns! Sheesh! ... [Rubs his back with both hands until it stops.] ...Ahhh... Better. Whew, that solves that problem! Now, let's move onto however you all got here faster than I did...
Tails: Sonic this could be serious! And it happens whenever you run too fast!
Sonic: Uh-oh... I know where this is going...
Tails: Maybe you should lay off your sonic speed for a little bit, at least until we can figure out this strange mark's purpose.
Sonic: ...Ouch... Ah, but Tails... That's what I do best... And I'm the best at it! So--
Rouge: [Interrupts.] Well Mr. Impatient, Tails is only thinking best for you, so it'd be best to do what he says.
...
Sonic: [Sighs and rolls his eyes.] ...Fine... But seriously, how'd you all get here so fast?
Cruce: [Points to himself with his thumb. He speaks in a mocking voice, though jokingly.] You're too slow!
Sonic: Hey! Not cool!
Celebi: [Scans the small lab.] So Tails... What happened in here?
Tails: When Mewtwo arrived, I was rushed out by those dark creatures. They made a mess of the place, and there are a lot of dangerous pieces of equipment around...
Celebi: Hmm... Well, Mewtwo or those shadows didn't hurt you at all, right?
Tails: Nope! You guys came to the rescue just in time. If it wasn't for you, I don't think I'd be around to help with these problems!
Celebi: Heheh, always willing to help a good ol' friend in need!
Sonic: [Shoots a glare at Celebi and grumbles under his breath.] ...Hmph...
Tails: [Turns to Sonic.] What was that Sonic?
Sonic: [Sits up quickly.] Huh!? Oh, uh, nothin'! Just some uh--thoughts out loud...
...
[Just then, the large monitor right above the desk begins to receive static. Everyone shoots their attention toward the flickering screen...]
...
[Static.]
Celebi: What's goin' on?
Tails: Looks like it's picking up a signal...
...
[More static...]
[Finally, the signal is picked up accurately. A man with a long, jagged mustache and a bald head of hair with goggles is facing the screen He appears to be wearing a red engineering jumpsuit.]
Dr. Eggman: Well, hello my furry friends... I see you are under a new threat's pressure...
Sonic: Oh great... Look who decided to show his hairy face...
Tails: Dr. Eggman... Just what are you up to...?
Dr. Eggman: Ohohoho! Tails, is that you?! My, you've changed since we have last meet...
Rouge: Skip it, Dr.. You contacted us for a reason, so tell us what you're up to this time...
Dr. Eggman: Oh, and Rouge is with you as well... You see, it's not what I am up to, but a much greater force colliding with our very world...
Sonic: [Sarcastically, but impressed at the same time.] The great Eggman, admitting he's weaker than someone else!? Stunning!
Dr. Eggman: Mock all you like. It doesn't change the inevitable. Sonic the pesky blue rat, you and your friends are truly in for a festival this time...
Sonic: [Scoffs.] When was the last time I heard that? Oh right, "Previously on Sonic the Hedgehog"... Dr., you've lost every battle. Unless you side with some freak like Mewt--...Uh-oh...
Dr. Eggman: Hoho... Precisely. [Snaps his fingers and Nightmares appear at each side of Eggman.] This is a warning... Take it seriously, or leave it unattended...and die. [A smirk forms under his mustache, and begins laughing maniacally, almost as if he were just about to break the line...]
Celebi: [Before that can happen... Celebi flies from Cruce's head and approaches the screen abruptly and aggressively.] Hey!
Dr. Eggman: [Instantly stops laughing at this unfamiliar voice and sight. Celebi and Lucario were off the screen the entire time from Eggman's view.] Oh...? What have we here? A small, green fairy of some sort?
Celebi: [Frustrated.] Wha--I am not a fairy! Now listen up! You'd better tell me where you gained control of the Nightmares!! I'm not gonna sit around and wait for answers anymore! First Mewtwo, than you... The famous Dr. Robotnik... Shouldn't you be toying around with mechanics and not Naught's magic!?!? Keep your nose out of my world!! [Breathing heavily and angrily.]
...
[Silence... Everyone waits quietly, somewhat shocked by Celebi's sudden mood swing.]
Cruce: (Ooh. Gettin' all riled up over it. I like it.) [Grins.]
Dr. Eggman: [Shocked.] ...You... know far too much...for a child. [Studies Celebi for a quick couple of seconds...] Ah... I know who you are now... I've been warned about you... Hmhm, good luck on your trials...Chris.
Celebi: Wh-wha...?
Cruce: [Walks into view.] Hello, Eggman.
Dr. Eggman: And yet another surprise? [Focused on the human now.] Even one who recognizes me. I am not surprised. Who would not? Hoho...
Cruce: Here's a helpful tip. [Wraps an arm around Celebi.] Stop tormenting Chris here. He's a good kid. 'Wouldn't want karma to come bite you in the a**, would you?
Dr. Eggman: Hmph... Mewtwo told me about a dangerous human lurking with you pesky heroes. Cruce, was it?
Cruce: My name's spreading, huh?
Dr. Eggman: It is... Whoever you are, this is not your world. You are here... altering the course of things to come. Heroes be warned, this Cruce should not be here and by your side nor Darkness'. This isn't a threat. It's the truth... [After that, the screen flickers to static...]
...

Celebi: [Still staring at the screen, wide-eyed at Eggman's last message.] ...Naught...
[Everyone in the room redirects their attention to Celebi and Cruce.]
Sonic: [Stands up from the chair, right in front of the two. His expression seems a bit more serious now... and irritated.] Okay, I'm done trying to guess... Chris? Cruce? Who are you two?
Celebi: ...[Lowers his head.] I'm... Just a misguided hero... From a misguided world.
Sonic: [Focusing on Celebi.] And something tells me that's not it...
Celebi: [Closes his eyes, thinking back to what Iphilas had said...
"...are not your family..." "But even they know all too well that you are not one of them... You never were."
Celebi begins straining, tightening his eyes shut... Thinking back to what Naught has previously said to him...
"For you shall become my Advocate..." "You are unique..." ...you shall learn how to manipulate this ability, and eventually uncover your true past..." "Overcome... and achieve."
Finally, Celebi opens his eyes, with a sorrowful look.]
...
[Silence before a response.]
...
Celebi: I'm... the one everyone in Reality is watching, the one who screwed up... They're waiting for something to happen... Something bad... Something... Apocalyptic...
...
And there will be no escape... For anyone, anywhere...
...
Cruce: [Nods.] Chris here... has a point.
[They shift their focus to Cruce.]
Cruce: All worlds are damned. All of them. It's... (It's so closely related to my point being here... I haven't even started anything yet... But I have to continue my plan to stay with Chris on his adventure. It may be the easiest way to end this.)
Tails: That can't be true... It... Cruce...
Cruce: I know... from experience. The world I once knew faded away; changed into something it shouldn't be. And with it, my friends, my family, my life... left me.
...
And to think...
...
Light and Darkness have the guts to tell you everything you knew was a lie.
--E N D I N G--
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Kinda more of a serious ending. There were funny parts in there though... somewhere.