Odd one out!

[EmTheGhost]

Mawile isn't a Normal type!

Goomy, Quagsire, Klefki

 

[Lycanthropy]

Klefki is the only one that doens't learn Muddy Water.

Poliwrath, Toxicroak, Seismitoad

 

[Ace Trainer 188]

Toxicroak isn't a Water type!

Luxio, Bastiodon, Staraptor

 

[strangerhypno]

Luxio isn't fully evolved

Breloom, Heracross, Mienshao

 

[miragespot]

Heracross doesn't have a pre-evolution.

Litwick, Trubbish, Tepig.

 

[Ace Trainer 188]

Trubbish is from a 2-stage line (and isn't part fire but i guess thats obvious)

Zorua, Tentacool, Drilbur

 

[Lycanthropy]

Tentacool isn't from the fifth generation.

Axew, Lapras, Poochyena

 

[Arma]

Lapras can't evolve! and also has a secondary typing


Hariyama, Horsea, Hypno!

 

[Ace Trainer 188]

Horsea isn't fully evolved and comes from a 3-stage line.

Poliwag, Oddish, Charmander

 

[Hyzenthlay]

Charmander can fully evolve without the need of trading or an item!

Lurantis, Vibrava, Leavanny.

 

[Xtr3me]

Lurantis' egg group is grass while the two others egg group is bug.
Sawk, Throh and Timburr?

 

[Ace Trainer 188]

Timburr isn't a single stage mon.

Lairon, Kirlia, Breloom

 

[miragespot]

Breloom doesn't evolve further.

Phanpy, Sandshrew, Geodude

 

[LadyJirachu]

Geodude is the only one that isn't a pure ground type :P (or even a ground type at all, if you're in alola)

Pikachu, Pichu, Marill

 

[Ace Trainer 188]

Marill isnt an Electric mon.

Zygarde, Lugia, Rayquaza

 

[Lycanthropy]

Lugia has only one appearance (no Primal version, cell parts, etc.)

Mime Jr., Porygon-Z, Type: Null

 

[LadyJirachu]

Mime Jr. isn't Normal. :P

Celebi, Mew, Scyther

 

[Enpatsu Shakugan]

Scyther isn't legendary

Rattata, Monferno, Whimsicott

 

[Lycanthropy]

Whimsicott's name doesn't end in a vowel.

Charizard, Typhlosion, Blaziken

 

[Ace Trainer 188]

Blaziken has different stats. And yes go look it up, the other 2 have the same stat distribution

Timburr, Kadabra, Squirtle