Odd One Out

[DyingWillFlareon]

Audino is the only one with a Mega. (Can we give Wiggly a Mega for Pokemon Special Blue? :D *or Silver will kill you cough cough*)

Vileplume, Bellossom, Victreebel

 

[KittiOcelotti]

Bellossom, its previous evolution can evolve into to kinds of pokemon

Bulbasaur, Squirtle, Charmander

 

[destinedjagold]

Bulbasaur, because he has two types. Probably(uncertain about the future) the only basic form starter that has two types. :3

Zapdos, Zekrom, and Thundurus.

 

[Meadow]

Zekrom is the only version mascot!

Moltres, Heatran, Entei

 

[DyingWillFlareon]

Kitti Vileplume does too :( In fact theymre the same evo line...

Skitty, Snubull, Flaaffy.

 

[d4rk]

Flaaffy is not fairy-typed I guess.

Dragonair, Salamence, Garchomp

 

[Pendraflare]

Dragonair is not fully evolved.

Shellder, Clamperl, Chinchou

 

[Lycanthropy]

Shellder is the only one not living in Underwater in Hoenn.

Porygon, Ditto, Grimer

 

[DyingWillFlareon]

Ditto has no evos.

Victini, Shaymin, Celebi.

 

[Meadow]

Victini is the only one that's first on its own Regional Dex.

Shroomish, Seedot, Budew

 

[Fil]

Budew made its debut in Sinnoh, not Hoenn like Shroomish and Seedot.

Scyther, Finneon, and Sylveon

 

[DyingWillFlareon]

Finneon is the only one who is Water typed.

Flygon, Milotic, Claydol.

 

[d4rk]

Milotic has one type/is Water-type.

Feebas, Magikarp, Goldeen

 

[Lycanthropy]

Feebas is the only one not evolving in a certain level.

Pineco, Pinsir, Piplup

 

[Meadow]

The third letter in Piplup's name isn't an "n." (Oh gosh, why "n"?)

Tropius, Shiftry, Torterra

 

[Pendraflare]

Shiftry isn't 4x weak to Ice.

Exeggutor, Leavanny, Crustle

 

[Fil]

Exeggutor is not a dual-type that includes bug type.

Hoppip, Lotad, and Cherrim

 

[Pendraflare]

Cherrim only has one type.

And that's not what I had in mind - what I thought was that Crustle isn't weak to Fire or Flying, but that works too.

Greninja, Octillery, Tentacruel

 

[Lycanthropy]

Greninja is the only one unobtainable in Johto.

Seadra, Seaking, Sealeo

 

[Lycanthropy]

Roserade is the only one with a baby Pokémon in its evolution line.

Manectric, Arcanine, Mightyena

Roserade is the only one with a baby Pokémon in its evolution line.

Manectric, Arcanine, Mightyena