Choice? Banned
This Pokémon was banned alongside Flutter Mane in what remains the fastest quick-ban in the history of OU.
What is Houndstone
Shelmet, Solrock, Scolipede.
It evolves Magmar into Magmortar.
What is Magmarizer
What is Mawile
These are the only two Pokémon never to feature in any episodes of the anime.
What are Porygon2 and Porygon-Z
Since its debut in Generation IV, this Pokémon has placed on the UU Ban List for every generation it's been present.
What is Staraptor
Bronzor, Bellibolt, Golurk.
What is Green
It evolves Clamperl into Huntail.
What is Deep See Tooth
Mega Mewtwo X and Y hold the records for the highest Attack and Special Attack of all Pokémon, respectively. In second place for each stands another Mega - Mega Rayquaza for Special Attack, and this Pokémon for Attack.
What is Mega Heracross
Aside from his victory against Drake in the Orange Islands, Ash's first Pokémon League championship title was earned in this region.
What is Alola
These two abilities, while legal independently, could not be run alongside one another in Gen V OU.
What are Swift Swim and Drizzle
Cufant, Pawmi, Dedenne.
What is Yellow
It evolves Skitty into Delcatty.
What is Moon Stone
These Pokémon are the only 2 who have only one ability before Mega-Evolving and retain that same ability after.
What are Latias and Latios
This was the third Generation 2 Pokémon to be revealed in the anime prior to the release of Pokémon Gold and Silver, preceded by Ho-oh in the pilot, and later by Misty's Togepi.
What is Donphan
This monstrously powerful Pokémon managed to keep out of Ubers for 3 generations, until Game Freak decided it'd be a good idea to give it Dragon Dance.
What is Kyurem-Black
Shellos (West-Sea), Bounsweet, Cherrim.
What is Purple.
It evolves Charcadet into Ceruledge.
What is Malicious Armor
This Mega Stone boosts base Attack and Speed by 70 each and decreases base Special Attack by 30.
What is Beedrillite
Due to censorship surrounding the episode's depiction of firearms, Western audiences missed the time when Ash caught 30 of this Pokémon.
What is Tauros
After having an oddly limited distribution for its first two generations, the move tail slap was rightfully given to this Pokémon... in turn causing it to be banned from Gen VII LC.
What is Aipom
Dragonite, Floatzel, Heatran.
What is Brown
It evolves Scyther into Kleavor.
Many Pokémon gain or change types upon Mega-Evolving, but only this one swaps the order of its dual-typing.
What is Mega Lucario
Following a downward trend in popularity since the success of Pokémon: The First Movie, this was the last animated Pokémon movie to release in American theaters until the 2017 release of Pokémon the Movie: I Choose You.
What is Pokémon Heroes