Odd One Out

[Cayo]

Noivern is a second evolution, while the other two are third.

Bidoof, Sentret, Rattata

 

[InfernalStorm]

Bidoof is the only Pokemon that receives a dual type on evolution.

Xerneas, Yveltal and Zygarde

 

[Cayo]

Zygarde is the only one who's shape isn't based off the first letter of its name.

Infernape, Blaziken, Emboar

 

[Starry Windy]

Emboar seems a bit bigger and heavier than the other two.

Hariyama, Machamp, Hawlucha.

 

[Cayo]

Hawlucha can fly, duh.

Flareon, Vaporeon, Jolteon

 

[Lycanthropy]

Jolteon is the only one without a tail.

Kingler, Clauncher, Crawdaunt

Zygarde is the only one who's shape isn't based off the first letter of its name.

I actually can see the Z shape in his body, looking at its side view. I don't know if this is coincidence, or not.

 

[Squirrel]

Crawdaunt is the only one with a second typing!

Magby, Elekid, Smoochum?

 

[blue]

Smoochum is the only one to evolve just once!

What about - Pidgey, Taillow, Spearow?

 

[Cayo]

Taillow isn't Gen I.

Ursaring, Snorlax, Raticate

 

[Squirrel]

Snorlax has a baby form!

Pachirisu, Chimecho, Misdreavous?

 

[blue]

Pachirisu is the only one that doesn't evolve!

Spoink, Abra, Ralts

 

[Meadow]

Abra was the only one introduced in Generation I!

Sewaddle, Joltik, Paras

 

[Starry Windy]

Paras is from Kanto, not Unova.

Lapras, Aurorus, Spheal.

 

[blue]

Aurorus is the only Ice/Rock-type of the three!

Klink, Mawile, Victreebel

 

[Meadow]

Klink is the only one who isn't dual-typed in Generation VI.

Squirtle, Mudkip, Froakie

 

[Squirrel]

Froakie is the only one that sucks that doesn't end up with a Mega form!

Sandshrew, Piplup, Magnemite?

 

[blue]

Piplup is the only Pokémon not introduced in Gen I.

Mawile, Sableye, Binacle?

 

[BumpsnStumps]

Binacle is the only one that evolves.

Chikorita, Bellsprout, Florges

 

[Cayo]

Bellsprout is the only one with a dual type in its evolution line.

Magikarp, Feebas, Remoraid

 

[Lycanthropy]

Magikarp is the only one unable to learn Ice Beam.

Azurill, Staraptor, Magmar.