Odd One Out

[classiccartoonsftw]

Garchomp has never fallen out of the OU tier.

Rhyperior, Electivire, and Magmortar

 

[Apollo]

Rhyperior doesn't have a baby form.

Meganium, Typhlosion, Feraligatr

 

[Renegade]

Meganium doesn't stand on all fours.

Togepi, Skarmory, & Grumpig~

 

[Nah]

Meganium doesn't stand on all fours.

Togepi, Skarmory, & Grumpig~

Togepi is the only baby pokemon.

Gastly, Fearow, Rhyhorn

 

[Apollo]

Rhyhorn is the only one who is affected by Ground type moves. Fearow is flying type, while Gastly has Levitate.

Scizor, Bulbasaur, Musharna

 

[orangeralts21]

Bulbasaur is the only one in a 3-stage evolutionairy line.

Rattate, Zubat, Tentacool

 

[Renegade]

Rattate

Rattata is the only non-poison type.

Gyarados, Crobat, & Dustox~

 

[Apollo]

Crobat is based on a mammal! :3

Arbok, Shuckle, Geodude

 

[Juno]

Shuckle is not part of any evolutionary line.

Kricketot, Burmy and Pineco.

 

[Apollo]

Burmy has a branched evolution.

Froslass, Gallade, Vespiquen

 

[Nah]

Vespiquen doesn't require a stone in order for its pre-evolution to evolve into it.

Octillery, Clawitzer, Kingler

 

[Apollo]

Clawitzer isn't native to the Johto PokeDex.

Omastar, Dustox, Dragalge

 

[acatfrommars]

Omastar and Dragalge can both learn surf, where Dustox cannot.
However, Dragalge and Dustox both start with the letter D, and Omastar does not.

Noivern, Druddigon, Charizard

 

[Renegade]

Charizard has a mega-evo, the other two do not (at least, not yet O_o).

Bulbasaur, Ivysaur, Venusaur~

 

[Apollo]

None of Ash's travelling companions (including Ash himself) own an Ivysaur.

Vulpix, Horsea, Magnemite

 

[Jolteon Dan]

Magnemite doesn't have a tail, whereas the other two have (at least) one. Also, Magnemite has 3 syllables in its name, whereas the other two have six letters each and two syllables in their names.

Igglybuff, Azurill, Cleffa

 

[Hiatus]

Two of these are pink, while other's blue.

What about... Politoed, Ninetales, and Metagross?

 

[Nah]

Metagross is the only one that doesn't have a weather summoning ability.

Dragonite, Aerodactyl, Pidgeot

 

[Apollo]

Aerodactyl is a fossil Pokemon.

Froslass, Mr. Mime, Swampert

 

[destinedjagold]

Swampert is the final evolution of a starter PKMN. ^^

Tentacool, Audino, and Fletchling~ ^_^