The Relation Game

[Dr. Silver]

Clefairy, since it is now a pure Fairy type AND has "Fairy" in its name!

 

[Yato]

Moonblast, a powerful move that Clefairy can learn via level up!

 

[Apollo]

Gardevoir can also learn Moonblast via level up!

 

[Cordelia]

Gallade is the male only companion to Gardevoir, but it doesn't make too much sense since Gardevoir can be male or female o3 o

 

[Apollo]

Froslass is also in the same situation as Gallade, haha. She's the female only companion to Glalie, and Glalie can be male or female. :)

 

[LavenderTownGhost]

However, Ditto does not have a gender.

 

[Apollo]

Mew can also transform, and has the same color as Ditto.

 

[acatfrommars]

Mewtwo, Mew's rival!

 

[Apollo]

Deoxys, a pure Psychic type legendary, like Mewtwo. They also have alternate forms of some sort! Mewtwo having two mega-evolutions, Deoxys having different forms.

 

[Dragalge]

Starmie, both Deoxy's and Starmie have easily breakable gems in their chest.

 

[Apollo]

Slowbro, another Pokemon native to Kanto, and they share the same type combination.

 

[Oryx]

Slowpoke, its initial evolution!

 

[Yato]

Shellder, because it's said that Slowpoke evolve when a Shellder attaches to their tail and devolve when it comes off.

 

[LavenderTownGhost]

Lorelei, an Elite Four member who uses Cloyster, Shellder's evolved form.

 

[Oryx]

Onix, Cloyster's....counterpart.

 

[Apollo]

Staryu, both of them are owned by a gym leader.

 

[Dr. Silver]

Torkoal, a Pokemon, like Staryu, that can learn rapid spin!

 

[Apollo]

Ash owned a Torkoal during the Hoenn arc!

 

[Yato]

Latias, who was smitten with Ash in the fifth Pokemon film.

 

[Serperion]

Draco Meteor a Tutor move taught to any Dragon-Type with a strong bond with the trainer, for instance Latias