- The Nidorino that appears in Professor Oak's introduction in Red and Blue has the cry of a Nidorina
- Every Eevee evolution has been owned by a main or recurring character in the anime. Except for Jolteon
- Pachirisu is the only Pokemon without any evolutionary stages allowed in Amity Square.
- The number of stripes on Electabuzz's tail changes on the official and sprite artwork between generations.
- Of all the Pokemon that can evolve, Sneasel has the highest base speed stat.
-In some early art for Venomoth, it was shown having yellow spots on the back of its wings. This was later removed.
- Raikou is the only legendary Pokemon Ash hasn't encountered in the anime or in one of the movies.
- One of Parasect's Pokedex entries says its spores are used as medicine in China, which is a rare reference to the real world.
- Hippopotas and Hippowdon are currently the only Pokemon whose male and female sprites use completely different colors.
- Gold and Silver only have 30 unique sound clips used for Pokemon cries in addition to the previous 37 from Red and Blue
-Red and Blue only use 37 completely unique sound clips for cries. The sounds are played back in different ways for each Pokemon.
- Kabuto's name in some game prototypes is "Att". This might be short for Atlantis.
- In the anime, the inside of Charizard's wings are colored green, but in the games, they are colored with more of a blue tint.
- Espeon and Umbreon are the only Pokemon that can be obtained by more than one evolution method.
- Wartortle's official coloring is inconsistent; its ear color often alternates between white or blue in various official art.
- When Rotom is encountered, the music is the same as legendary encounters. It's currently the only non-legendary to do this.
- Deoxys was the first Pokemon to have its own unique battle music in-game
- In Red and Blue, you were able to use a fishing rod on the Rhydon statues. However, nothing was found unless you used an Old Rod.
- Zapdos is the only legendary bird to never be seen on its feet in a sprite: all of its sprite artwork depicts it airborne.
- Ninetales's name was originally spelled as "Nine Tales" (two words instead of one) in some early copies of Red and Blue.
- Heatran is the first (and currently only) legendary Pokemon that can either be male or female.
- Jirachi and Manaphy are the only two Pokemon who can't be found at an in-game location in any of the main games.
- In the Galactic Hideout in Eterna City, Jupiter has a Skuntank at level 20. Stunky can't evolve into Skuntank until level 34.
- In Super Smash Brothers Melee, Ditto can be summoned from a Pokeball via hacking, but he disappears the second he comes out.
- Some Pokedex entries say that Raichu can discharge up to 100,000 volts. However, its Pokemon Stadium entry only says 10,000 volts.
- Only two Electric-type Pokemon are known to have the "Lightning Pokemon" species name; Electrike and Jolteon
- In the anime, Seaking is the only Pokemon Ash and Misty both owned, but they were both caught and released in the same episode
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- Lucas's and Dawn's Platinum artwork shows them holding Repeat Balls. It could be a pun because Platinum "repeats" Diamond/Pearl.
- Every Spinda has a unique pattern of spots. In-game, there are exactly 4,294,967,296 possible outcomes (Not counting shiny).
- In Red/Blue, Koffing's crossbones pattern was above its face, but in the Japanese Red/Green, it's below.
- Rhydon is tied with Lairon in weight, with both of them weighing exactly 264.6 lbs.
- Rhydon appears first in the game's Pokemon index data in Red/Blue. This is why most glitch Pokemon "evolve" into him.
- Croagunk's game sprites show it with pink cheeks, but all of its anime appearances show it with yellow cheeks instead.
- Bayleef is the tallest of any of the second-stage starter evolutions.
- Some of Glalie's PokeDex entries say it has a hard body made entirely of rock, despite the fact that Glalie is an Ice-type
- Corsola and Relicanth are the only Water/Rock Pokemon that are not revived fossil Pokemon
- Eevee is the only Pokemon that is given to you by an NPC in all four generations
- Heracross is the only Bug-type Pokemon able to learn Megahorn, even though Megahorn is a Bug-type move
- In-game, Caterpie and Goldeen have the exact same cry.
- G/S/C are the only games where the starters begin with hold items.
- In Japanese versions of Pokemon, "Save" is labeled レポート (Report), and you submit a ポケモンレポート (Pokemon Report).
- Zigzagoon and Aipom are the only Pokemon with the Pickup ability that can keep it when they evolve.
- Spinarak was created in a children's Pokemon design activity in the American Trading Card Game League
- Despite Psyduck's PokeDex entries talking about its headaches and psychic powers, it's not a Psychic type (neither is Golduck)
- The DS game's Pokedexes can list Pokemon by color. Bronzong is listed as "Green", despite being colored blue
- Every Electric-type Gym Leader has light-colored hair. They are also the only leaders to wear military-styled clothes
- Magcargo's Pokedex entries say that its shell breaks easily, but in the anime, it retracts into its shell to protect itself.
- Hitmonchan and Hitmonlee are the only Pokemon that weren't previously related, then later gained a shared pre-evolution
- Latias and Latios were the first legendary Pokemon to have set genders, or even genders at all.
- None of Cascoon's sprites show it with two eyes, despite that it's been well-established it has two.
- Mew can learn Attract and Captivate despite being genderless. However, it always fails unless the opponent is also genderless.
- Mew was the only Pokemon of the first 151 to be left out of the original version of the Pokerap
- Sneasel and Weavile are the only two Ice-types able to learn Surf without being Water-type as well.
- In terms of base stats, Shuckle and Munchlax are tied as the slowest non-glitched Pokemon in existence.
- So far, the only Pokemon who can learn Flash via leveling up is Volbeat.
- Gliscor is actually lighter than its pre-evolution; Gliscor weighs about 93.7 lbs, while Gligar is about 142.9 lbs
- Gliscor and its pre-evolution Gligar are the only Pokemon to have a Ground/Flying type combination
- All official Koffing art shows it smiling. However, all official Weezing art depicts it frowning
- In Generation 1, catching a Mew that transformed results in a glitch where the caught Mew turns into a Ditto
- In Pokemon Rumble, Transform isn't a move, so Ditto can only know Struggle. Ditto is also the only character that can use it.
- Lickilicky is the only Normal-type Pokemon that can learn the move Explosion
- Croagunk's evolution line is the only Pokemon to have a double weakness to psychic-types.
- Golbat and Chansey are the only evolved Pokemon that can evolve to a third form via happiness
- Yanma and Yanmega are the only Pokemon whose names begin with the letter Y
- If Kanto's landscape were made to fit that of modern-day Japan, Saffron City occupies the space where Tokyo should be
- Anime Giovanni's Persian is most likely Shiny; the fur seems normal, but the inside of its ears are pink instead of tan
- No Slowpoke has ever been seen using an attack in the Anime, despite showing up multiple times
- As of Generation IV, Flareon is the only fully-evolved Fire-type Pokemon that cannot learn SolarBeam.
- Japanese Red and Green contain an un-attainable Surfboard item. It's actually usable, and lets you surf without a Surfing Pokemon.
- Lairon does not learn any Rock-type moves by leveling up, despite being part Rock
- Lt. Surge is one of two Leaders who is known to have lived outside of the Pokemon regions; the other is Fantina.
- In G/S, Full maps exist for the Cinnabar Island Lab, indicating it was to be playable at some point
- There has never been a bug-type Pokemon that can learn Fly or Surf.
- Poison-types can't be poisoned. The same goes for Steel-types.
- Acid is the ONLY Poison type move that can not Poison you, and is the only Poison move that lowers a stat.
- Salamence is actually lighter than its pre-evolution Shelgon, weighing 226.2 lbs compared to Shelgon's 243.6 lbs
- An unused ability, Cacophony, is inside the code of R/S. It's identical to Soundproof (allows a Pokemon to avoid sound attacks)
- In Diamond/Pearl, Rain can appear on Route 213, but only if your DS clock is set to July 11, December 2, or December 31
-In Diamond/Pearl, the snow in Snowpoint will change to sparkling snow if your DS clock is set to January 12th
- FR/LG contain the Mach and Acro Bike in the game data. If you hack either into your bag, they work like the normal bike.
- Drapion is the only Pokemon owned by Aaron of Sinnoh's Elite Four that is not Bug-type (the type he specializes in)
- The fact that Pokemon can breed with each other technically makes all Poke-on-Poke porn ever made canon. Sad, but true
- Charizard is the only Pokemon in the Super Smash Bros games that transitioned from a Poke Ball Pokemon to a playable character
- Illumise and Volbeat can be found all day in Diamond and Pearl, unlike real fireflies who are nocturnal
- Every major team/group in the main games have had at least one of their members use Zubat and/or one of its evolutionary family.
- Some pieces of Japanese art for Slowpoke shows that they have the same striped bellies that Slowbro and Slowking do
- In the games and official artwork, Drifloon is purple, but in the anime it is pink. It shares this trait with Nidorino
- Giovanni can actually be battled in HGSS, but is currently unaccessable without hacking. He will probably be in an upcoming event
- Morty is the only rematched Gym Leader to use more than one of the same Pokemon (Gengar)
- Nintendo made 6 Pokemon-themed GBA systems. They also manufactured 7 GBA SP models, and one special GB Micro model.
- Giovanni is the only criminal boss not to endanger a legendary pokemon with his exploits.
- Porygon (as well as its evolutions) have never appearead again in the Anime after the infamous "seizure episode"
- There was never a Mew under that truck in Vermilion. However, in FR/LG, there was a note telling you how to get a Lava Cookie.
- In the DS games, hacking the camera to force it into its 3D mode reveals that some indoor objects are actually full 3D models.
- If you plugged in Gold or Silver, the backgrounds were made just for Stadium; they won't appear in a real Super Game Boy
- Prior to Gold and Silver coming out, many websites incorrectly referred to Marill as "Pikablu"
- Prior to the second generation, many pieces of Pokemon merchandise wrongly listed Togepi's Pokedex number as 152.
- The English version of "Mewtwo Strikes Back" portrays Mewtwo as a cold villain. The Japanese version portrayed him as confused
- Pokemon Rumble is the only game where one of the starting characters is a Ratata
- Gold and Silver contain unfinished Safari Zone data. It's one small map with no encounters, but it has 4 types of land inside.
- Most of the Pokemon Mini games emulated in Pokemon Channel are heavily edited from Party, the free Mini pack-in game.
- In the US, preordering Colosseum got you a bonus disc. It contained the transferable Jirachi from other region's Channel games
- in 2006, Square-Enix developed a Pokemon title for cellphones in Japan. It allowed you to chat using various Pokemon for avatars
- In R/S/E, there are several remixes of G/S tracks that are still in the game's data, but are not heard during normal gameplay.
- Grass and Rock have the most weaknesses (5 each), but a Grass/Rock type (e.g. Cradily) is only weak to Ice, Poison and Steel.
- 12 Pokemon in Kanto didn't participate in evolution, while Johto had 19, 28 in Hoenn, and 19 in Sinnoh.
- In the 1st gen, High Jump Kick only did 1 damage in recoil when it missed due to a bug
- All 4 proffesors are named after trees. Oak, Elm, Birch, & Rowan
- In R/B, it was possible to make your pokemon use a move with 0 PP in certain situations, rolling it's current PP over to 63.
- The names of the Soul Badge and the Marsh Badge were originally supposed to be the other way around
- In R/B/Y, it was possible to legally get 255 EVs in all stats on a Pokemon
- The Pokémon Gold/Silver time-keeping battery lasted on an average of about 7 years
- There are two unused Pokemon types in R/B; ??? type and BIRD type (Yes, it's in all caps)
- Lorelei was the only Elite 4 member in R/B/Y to not have two of the same Pokemon.
- In R/B/Y and G/S/C, besides rivals, Gym Leaders, and the E4, the only trainer with 6 Pokemon is a fisherman with all Magikarps.
- The move waterfall was first introduced as an HM in G/S/C, but it was naturally learnable by Goldeen in R/B/Y
- If you attempt to import Missingno into Pokemon Stadium, it comes out as a substitute doll.
- Back in R/B/Y, Hyper Beam didn't recharge if you fainted a Pokemon with it.
- Shiny Pokemon actually existed in R/B/Y, but they just wouldn't appear to be shiny until you transferred them to GSC
- Giratina is the only 2-type Pokemon weak to both its own types
- Ditto cannot transform into a Ditto that already transformed into another Pokemon
- ??? is a type programmed into games that has no resistance or weaknesses (glitch Pokemon get this type a lot)
- In Yellow, you could make your Pikachu very happy by offering him potions again and again, even if he didn't need them
- Oak was intended to be a trainer in RB. Leftover data says that Oak would use Tauros, Exeggutor, Arcanine, Gyarados, and a Starter
- In Super Smash Bros. Melee, all seven starters could appear in fights in some form except for Totodile (Not counting Trophies)
- Both Tyranitar and the Hippowdon evolution line can control the weather by creating sand storms.
- In FireRed/LeafGreen, the Rocket Warehouse passwords are palindromes: "goldeen need log" and "yes nah chansey"
- Gold/Silver and Crystal introduced the phone, which was then forgotten about until Emerald. Then it was lost again in D/P!
- Scyther and Seaking have the same cry.
- Kanto introduced 5 legendary Pokemon. Johto had 6, Heonn 10, and Sinnoh had 13 (not including Phione)
- In R/B, encountering Missingno would increase the quantity of the 6th item in your bag to 255
- Magikarp was obtainable in all regions, yet in only one region is it available before the first badge (although it's at level 5)
- The maximum amount of points you can receive in Pokemon Snap is 17,378,000
- Defeating the Elite 4 multiple times had no reward other than filling up your Hall of Fame until FireRed/LeafGreen (via stickers)
- There are 38 non-legendary Pokemon that do not evolve or have a pre-evolution.
- Gastly and Haunter weigh the least out of any Pokemon at 0.02 pounds. To compare, Gengar weighs 89.3 pounds
- Any Unown can be caught with a guaranteed chance when using a Dusk Ball or a Repeat Ball (and the Master Ball)
- The names of the three legendary birds each end with the first three Spanish numbers. ArticUNO, ZapDOS, MolTRES
- In R/S, May/Brendan would never battle you with a fully evolved starter
- The original Pokemon prototype was built on a NES. This was done due to the NES having similar physical power to a Game Boy.
- Mewtwo is a clone of the Pokémon Mew, yet it comes before Mew in the Pokédex
- No other rods have been invented other than the Old, Good and Super Rods.
- There is no attack that increases a Pokemon's accuracy (not counting Acupressure; it raises a random stat)
- Emerald and Platinum are the only games where you can rebattle Gym Leaders
- Blue/Red’s only trainers you could rematch were the Elite 4 and the Champion
- Diamond/Pearl is the first game where capturing all the different Unown types actually unlocks something
- FR/LG were the first games where you lose a proportion of money instead of half if all your Pokemon faint.
- A Pokemon's cry changes slightly when its HP is low or when it is about to faint
- If you deposit 999 pokemon in Pokemon Ranch, you can trade an egg for a Mew
- Sinnoh is the only region in which all of the starters gain a second type when they evolve
- Bulbasaur is the only starter to begin with two types
- Porygon Z is the only Stage-3 Pokémon which can be had without hacking at Level 1
- Golduck shares Rayquaza's abilitiy to control the weather by stopping it
- Yellow was NOT the only game in which Jesse and James appeared in. They also appeared in Pokemon Puzzle League
- Smeargle cannot learn any TMs, yet can learn almost any move through Sketch.
- There are 3 Legendary Pokemon that have been of a level that is not divisible by ten (47). (Palkia, Giratina, and Dialga)
- 10 legendary Pokemon have been level 50 when found (Articuno, Zapdos, Moltres, Cresselia, Mesprit, Uxie, Azelf, Raikou, Entei, Suicune)
- 2 legendary Pokemon have been level 60 when found (Lugia and Ho-Oh in Crystal)
- Rotom is not a legendary because it can breed more of itself AND it will reappear at the TV if you defeat it.
- 3 HMs that have been in one generation have not been in a future generation and never returned, as of yet. (Flash, Whirlpool and Dive)
- In B/R/Y, Pokemon did not heal when placed in the PC unlike in all the other games.
- In R/B/Y, you would ‘black out’, but in G/S/C and R/S/E/FR/LG you would white out. However, you black out again in D/P.
- D/P was the first generation that you could catch Porygon in the wild.
- There are 5 Pokemon that can become pure flying type in certain conditions: Kecleon, Porygon, Porygon-2, Porygon-Z, and Arceus.
- In RBY, Brock gives you the Boulder Badge while still in the battle, whereas every gym leader after that gives it to you on the field screen
- Electabuzz spelled backwards has zubat in it.