Odd One Out

[NoGoodUsername]

Making a guess here and saying it's Butterfree, because it's the only one that isn't 4'.

Charizard, Dragonite, Garchomp.

 

[TaichiWind]

Dragonite doesn't have a Mega Evolution!

Dragonite, Lugia, Swanna

 

[Hero of Twilight]

Dragonite isn't a sea animal!

darkrai, dialga, or palkia?

 

[Nah]

Darkrai, since its not part of the Creation Trio.


Sneasel, Gligar, and Snubull.

 

[Judge Mandolore Shepard]

Snubbull since it evolves by level, not by holding a item and at a specific time of day

Gogoat, Heliolisk, Greninja

 

[Hikamaru]

Greninja. It's the only one not part of a two-stage evolution line.

Mamoswine, Ambipom, Goodra

 

[Nah]

Goodra, since its not the evolved form of a Pokémon that was first introduced in a previous generation (Piloswine=Gen 2 Mamoswine=Gen 4 and Aipom=Gen 2, Ambipom=Gen 4).


Pikachu, Charmander, Rattatta.

 

[Kameken]

Charmander isn't a rat.

Typhlosion, Klingklang, Avalugg

 

[Clemstar]

Typhlosion. It isn't based off an inanimate object.

Meditite, Venusaur, Blaziken.

 

[Fernbutter]

Venusaur because it is quadruped.

Gengar, Shuppet, or Dusknoir?

 

[IeUaN_08]

Gengar,

Because it has feet?

Oddish, Bellsprout, Exeggcute

 

[CliCliW]

Exeggcute only has two parts in its evolution line, while Oddish and Bellsprout have 3

HootHoot, Spearow, Taillow

 

[Wicked3DS]

Hoothoot doesn't end in "ow"

Charizard, Scizor, Garchomp

 

[Hikamaru]

Charizard, it's the only one that changes types when it Mega evolves, to Mega Charizard X.

Florges, Togekiss, Gallade

 

[Judge Mandolore Shepard]

Florges since it was introduced in Gen VI and not Gen IV

How about Beartic, Ursaring, and Tropius

 

[Nah]

Tropius, since its not based off a bear.

Weezing, Arbok, Toxicroak

 

[Sonata]

Toxicroak, it's the only one not from gen 1.

Azumarill, Gyarados, Wigglytuff

 

[CliCliW]

Gyarados is the only one who didn't get retyped to Fairy in gen 6 :)

Swirlix, Scther, Onyx

 

[Sonata]

Scyther, it's the only one that's not spelled right :P

Diglett, Drifloon, Drillbur

 

[Wicked3DS]

Drifloon is the only balloon.

Snorlax, Spinda, Exploud