The Pokemon Link Game

[Br0k3n s0Ul]

Heliolisk. (They both can strangely learn Surf.)

 

[Ascended Dialga]

Houndoom (They can both have the Solar Power ability; it's Heliolisk's HA and it's also Mega Houndoom's ability.)

 

[Br0k3n s0Ul]

Mighteyena. (Both are canine-like Dark types.)

 

[HM02gon]

Azumarill (Both evolutions of Pokemon that received overworld sprites in gen 3)

 

[Br0k3n s0Ul]

Togekiss. (Both climbed the tier ladder in gen 6)

 

[Crimson Penguin]

Roserade (both evolved from their pre-evolution with a Shiny Stone)

 

[Ascended Dialga]

Turtwig (Both are used by Gardenia in DPPt)

 

[The Pokemon Broadcast]

Oshawott (both are starters with Shell Armor as their hidden ability)

 

[CyberBlaziken]

Corphish (Both Pokemon can learn the move Razor Shell)

 

[Tsukuyomi56]

Clawitzer (both can learn Crabhammer)

 

[Ascended Dialga]

Kingler (They both have an oversized claw.)

 

[raichu27]

Crawdaunt (They're both crabs)

 

[TrottingMinccino]

Sharpedo (That are both Water/Dark types from Hoenn)

 

[Ascended Dialga]

Gyarados (They both have Water/Dark-type Mega Evolutions)

 

[raichu27]

Charizard (They both have a secondary type change on a mega evolution)

 

[Br0k3n s0Ul]

Mewtwo. (They both have two megas)

 

[raichu27]

Mew (They're both legendary Psychic Pokemon from the 1st Generation)

 

[Ascended Dialga]

Celebi (They're the only legendary Pokémon that have the Medium Slow experience growth rather than the Slow one. They're also both Psychic-type mythics.)

 

[raichu27]

Victini (They're both an event legendary Psychic Pokemon with a starter type as a secondary type.)

 

[CyberBlaziken]

Jirachi (Both are classified as Mythical Pokemon)