Odd One Out!

[Otamajakushi]

Sylveon doesn't have a type advantage/disadvantage relationship with the other two!

Mew, Deoxys, Azelf?

 

[ジュナイパー]

Deoxys is the only one that has multiple forms!

Machop, Machoke, Machamp.
(I'm typing this on an iPad, and it autocorrected Machop to MacBook...)

 

[Judge Mandolore Shepard]

Machamp is the only one with four arms

Lopunny, Gardevoir, Medicham

 

[Zoroark Cutie]

Lopunny is the only one who didn't get a mega evolution in X and Y.

Toxicroak, Volcarona, Xatu

 

[Lycanthropy]

Toxicroak is the only one that can't fly.

Ponyta, Mareep, Girafarig.

 

[PageEmp]

Girafarig can't evolve further!

Metagross, Ambipom, Empoleon. This one should be quite easy XP.

 

[Judge Mandolore Shepard]

Ambipom is the only one that is not part Steel type

Vaporeon, Glaceon, Sylveon

 

[Zoroark Cutie]

Sylveon is the only one who doesn't resist its own type.

Hippowdown, Unfezant, and Meowstic

 

[Lycanthropy]

Unfezant is the only one I've ever used in-game.

Politoed, Honchkrow, Sylveon

 

[PageEmp]

Honchkrow has dual typing.

Bulbasaur, Pidgey, Nidoran♂

 

[Lycanthropy]

Bulbasaur is the only one that can't be found on Kanto Route 3.

Tympole, Wooper, Mudkip

 

[Zoroark Cutie]

Whooper is the only one with just one evolution while the other 2 have 2 evolutions.

Skarmory, Ferrothorn, and Klefki