Nature=Pokemon

[*Jean Grey*]

mild Milotic (duh)
jolly Ludicolo
gentle Blissey

 

[Ash's Pika Pal]

How about quirky nature, for Kecleon?

 

[ellie]

Lonely Mewtwo, Jolly Lombre, and Bold Exploud.

 

[Infinite Master Sceptile]

Quiet Chimecho
Brave Heracross
Lax Snorlax
Quirky Kecleon
Sassy Delcatty
Naughty Sableye
Rash Sneasel
Relaxed Sceptile
Timid Whismur
Lonely Cubone

I once had a Sassy Regice.

 

[Arena Tycoon Slaking]

Lol this is the complete opposite Calm Gyarados lol

 

[Adrexus]

lax slaking obviously
timid clefable
relaxed slowpoke
that's all i can think of for now

 

[Raden Surya]

Naughty Jynx lol...no..maybe Modest.
Kangaskhan should be Calm or Careful because she has a baby..

 

[~Flareon~]

Brave Blaziken
Gentle Pikachu
Quiet Lombre

 

[Vycksta]

Sassy Persian.
Adamant/Bold Scizor.

 

[the_showstopper]

Quiet MewTwo. If you read the Pokedex it says that they hide in caves to store energy for battle.
I have a Quiet nature MewTwo!!!

 

[Arena Tycoon Slaking]

Brave salamence maybe?