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"All right, Onix, use Slam!" Onix quickly complied, attempting to tackle the "other Onix". Unfortunately, the illusion dissipated at the last second, and Onix ended up face-first in the wall. The rock snake pulled its head out of the new indent, only to see Kitsune mooning it. This abruptly caused Onix to charge at it again, ignoring Brock's orders, only for the vulpine Pokemon to jump out of the way, letting Onix eat dirt once again. Thus began a rather amusing cycle: Kitsune makes taunting (and occasionally crude) gesture, Onix charges at the Zorua like a bull in steadily increasing fury while ignoring Brock's orders, furry little trickster jumps out of the way at the last second with a "Zoru!" that sounds suspiciously like the "Olé!" used by a stereotypical matador, Onix eats dirt and/or wall. Rinse and repeat.
Cadaver blinked, noticing the calm smirk on Koras's face indicating this was some kind of strategy. "...I'm honestly not quite sure if this still counts as a battle at this point... still, I suppose this strategy DOES fit the little guy's nature well," he muttered in amused exasperation.
The egg was tilting this way and that eagerly in Lilian's hands, almost as if trying to watch the show.

...Yeah, with the father being a prankster and the mother absolutely loving said pranks, that egg was probably going to be a prankster from the second it was made.
Naturally, Kitsune followed through with quite a few of his mate's suggestions, especially some of the funny ones. After several minutes, the Onix began showing signs of fatigue, until eventually it collapsed on the ground, panting as it tried to catch its breath.
It was at this point that Kitsune quite calmly walked up to the massive Pokemon and blasted its face at point-blank range with an Incinerate. To add insult to injury, the Zorua happened to be mooning it again at the same time that the Incinerate attack was being used, if you get my drift.
Needless to say, between the smell, the burning, and its fatigue, Onix was K.O.'ed.
Brock sighed as he recalled his Pokemon, but nevertheless smiled as he walked up to Koras. "Well, that was certainly an impressive strategy; wear out my Pokemon until it could be taken down by a weaker move. Was the farting part of that really necessary, though?" he asked.
Koras just shrugged with an apologetic look on his face; he honestly hadn't expected Kitsune to do that - the Incinerate, yes, using said Incinerate from its rear end, no.
Brock sighed again and shook his head, nevertheless still smiling as he handed over the Badge. "Anyway, here you are; the Boulder Badge."
Koras practically beamed, then headed over to Lilian and Cadaver to show off his new badge. Kitsune followed, once again trying to scrabble up Lilian to get to Sweets and his Egg.

"Zorua!" Kitsune agreed with that bit about the egg; he didn't have anything against the Pikachu line - if he had, he wouldn't have chosen Sweets as his mate - but he was hoping the egg would turn out to be a Zorua. After all, the more pranksters, the merrier, right?
Koras shook his head at his Pokemon's antics and exited the gym with his arm in Lilian's, smiling as they headed to the Pokemart.
"Excuse me." Koras blinked and turned to see a strange boy around Koras's and Cadaver's age walked up to them, a shiny Scyther by his side. "I couldn't help but see your Gym Battle through the window of the Gym just now, and it interested me; might I trouble you for a battle?" he continued, speaking to Koras. The boy's voice was polite and neutral, but something about it seemed... off, as if his tone were a little too neutral.
However, before Koras could say anything, Cadaver butt in smoothly, walking up to the strange green-haired boy and the Bug-type with a small smirk on his face. "Well now, you can't just expect a guy to have one battle right after another, you'll wear him out. If it's a battle you're looking for, though, I'm more than happy to oblige." Carnage was, too, if the bloodthirsty little gleam in the Ghost-type's eye was any indication. Cadaver was acting a bit odd, though; his tone had an edge to it that definitely hadn't been there before...

The two nodded, Cadaver's gaze not leaving the boy. "Acceptable. I only have the one Pokemon anyway." With that, the two and their Pokemon got in position, and the battle started.
"Slicer, Fury Cutter." The Scyther immediately vanished in a burst of speed, reappearing in front of the Duskull.
Cadaver just smirked. "Carnage... sic 'em."
Suddenly the gleam in the Ghost-type's eye grew to an outright blood-crazed look, and you could actually start feeling the bloodlust rolling off of the little guy; it even made the boy's Scyther stumble back with a hesitant, slightly scared look, though the boy himself seemed just as unaffected as Cadaver was. With that little bit of hesitation provided, Carnage immediately went on the offensive, slashing at the Scyther again and again with Shadow Claw as if trying to gut the Bug-type, not letting up for a second and forcing the Scyther to go on the defensive.
Koras shivered with wide eyes at the display of bloodlust Carnage was giving off, but managed to get out his Pokedex and scan the little guy.

Carnage - Lvl 25 Shiny Duskull
Ability: Pressure
Nature: Docile
Moves: Shadow Claw, Shadow Sneak, Confuse Ray, Pursuit

Koras blinked, looking from the red Ghost-type to the Pokedex and back again; if that was docile, he'd eat his foot, and he wasn't sure, but he could've sworn Duskull didn't get the PRessure ability until they evolved...

Note: Specimen exhibits signs of borderline DID. This particular version of Pressure seems to be based off pure, unadulterated bloodlust from the second part of its personality. Caution is advised.

Oh. That'd do it... certainly explained why Kitsune was wide-eyed and shivering uncontrollably, at any rate.
What was REALLY disturbing, however, was that the Egg actually began hopping around in Koras's hands as if excited, forcing the boy to keep a slightly tighter grip on it.

With the battle called, Cadaver recalled his Pokemon so it could calm down from its little bout of bloodlust, the pressure in the air lifting.
The boy glanced at his Scyther, noting how fatigued it seemed from trying to block the nonstop onslaught of attacks, and nodded. "Very well." He then looked back over at the trio. "However, I would like to ask if I may travel with you, if only until I can get a match against Koras?" Koras blinked; he could've sworn they hadn't mentioned his name, and there was no way he could've heard it during the gym battle if he'd been watching all the way from the window...
Cadaver glared. "No," was his simple reply.
The boy quirked an eyebrow. "Oh? Why not?"
"Because we don't accept members of Team Rocket into our little group, much less one of their highest-ranking members."

"Probably just Koras; they wouldn't send one of their top 5 Kanto agents after anything that wasn't worth their time. Isn't that right, Hive the Strategist?" Cadaver asked coldly, his despise toward the boy in front of him evident.
The boy just smirked, not bothering to deny it as his eyes suddenly got a calculating look to them, his Scyther suddenly straightening to indicate it had only pretended to be tired. "Well, you're certainly well informed." Hive noted, dropping the false friendly tone for a monotone voice. "However, we're afraid your information is a bit out of date; Wildfire and Gaia were relocated a few days ago to the new bases in Unova and Sinnoh, respectively. Only three Generals to each region, now." He examined Cadaver with interest. "Bloodthirsty, genetically modified Duskull... Red eyes... lack of any discernible pulse and a scent faintly reminiscent of rotting flesh... you're the escaped Project Immortales, aren't you?"
Cadaver's glare only hardened. "My NAME is Cadaver, and I'm nobody's 'project'... least of all Team Rocket's."
Hive chuckled, though it was a disturbingly hollow sound with a slight buzzing noise to it. "A synonym for corpse... fitting." He tilted his head. "We fail to understand why you didn't join Team Rocket and become one of the Hoenn Generals. They made you what you are today, after all."

Cadaver grunted, obviously not in the best mood after their little encounter, not that anyone could blame him. "In order: the day I join Team Rocket is the day hell freezes over, long story that I'll explain once we're in private, get your Pokemon strong enough to take down one of the weaker Legendaries without breaking a sweat... though a little Repel might help, too, for reasons I'll explain with the rest of the story."
Koras was silent a moment as he contemplated Cadaver's words, then seemed to accept that on the basis that Cadaver and Hive hadn't exactly been acting friendly toward each other, calmly turning to the rather baffled salesperson and buying a few Repels.