Odd One Out

[Nidorina of Time Lord]

Kingdra did not need a water stone to evolve.
Also I don't currently have Kingdra but that's a different story.

Starly, Pidgey and Fletchling.

 

[Shak]

Fletchling is the only one that doesn't retain it's Normal/Flying typing when it evolves

Phanphy, Buizel, Helioptile?

 

[Sirfetch’d]

Buizel is the only one who can be paralyzed.

Dusclops, Banette, Sableye?

 

[Zoroark Cutie]

Sableye is the only one who is a single stage Pokemon.

Magnezone, Lickilicky, and Probopass

 

[Shak]

Probopass is 4x weak to fighting, the other two are only 2x

Sceptile, Empolean, Charizard?

 

[Tsutarja]

Empoleon lacks a mega evolution!

Scyther, Pinsir, Koffing?

 

[Zoroark Cutie]

Koffing is the only one who is not a bug Pokemon.

Cherrim, Hippowdon, and Pyroar

 

[Lycanthropy]

Cherrim is the only one without different appearances for male and female.

Scraggy, Snivy, Pancham

 

[Zoroark Cutie]

Snivy is the only one who has 3 parts in its evolution.

Goldeen, Buizel, and Alomomola

 

[PageEmp]

Alomomola can't evolve, but the other 2 can.

Accelgor, Durant, Escavalier

 

[Sirfetch’d]

Accelgor isn't part Steel!

Raticate, Golbat, Koffing?

 

[destinedjagold]

Koffing isn't based on an animal.

Magneton, Magmortar and Electivire~

 

[Zoroark Cutie]

Magneton is the only one not fully evolved.

Kabutops, Cradily, and Crustle

 

[Granzen]

Crustle is not Fossil.
Grimer, Koffing, Gulpin.

 

[Nidorina of Time Lord]

Gulpin is from generation three, the others are from generation one.

Vulpix,Growlithe and Flareon

 

[Tsutarja]

Growlithe isn't based on a fox!

Fennekin, Vulpix, Ninetales?

 

[Sirfetch’d]

Fennekin is the only starter from the three!

Budew, Riolu, Elekid?

 

[Zoroark Cutie]

Elekid was the only who was introduced in Gen 2 and not Gen 4.

Giratina, Kyurem, and Zygarde

 

[Sirfetch’d]

Kyurem doesn't have an ice weakness!

Flareon, Entei, Charizard?

 

[Starry Windy]

Entei, for a couple of reasons. Being a Legendary, and being the one who is from Johto region.

Lapras, Spheal, Glalie.