Ash

Ash's pikachu

Ash's Grovyle

Ash's corphish

Ash's phanpy

Ash's swellow

May

May's squirtle

May's combusken

May's munchlax

Max

Brock

Brock's foretress

Brock's mashtomp

Kidd

Kidd's weavile (1)

Kidd's weavile (2)

Sir Aaron

Sir Aaron's lucario

Sir Aaron's pidgeot

Lady Rin

Lady Ilene

Jessie

James

James' Chimecho

James' cacnea

Meowth

Lady Ilene's servant

Mew

Benks

red Army

Green Army

and a lot of wild pokemon

I think that's about it about the characters in this movie...if theres some missing feel free to correct my errors :D