>Pokemon Trainer [Chespin, Marshtomp, Charizard]
Alternate costumes change the generation and gender, final smash is still triple finish, but actually good. And I'm counting this as one character.
>Pikachu
Alternate costume Shiny, final smash is Raichu, which makes him slightly more powerful and quick with every move until he gets KO'd.
>Jigglypuff
Alternate costume Shiny, final smash is Wigglytuff, which makes her slightly more powerful and quick with every move until she gets KO'd.
>Scizor
Alternate costume shiny, final smash is Mega Evolution, this lasts for seven seconds or so.
>Mewtwo
Alternate costume shiny, final smash is Mega Evolution X/Y and Down B to switch between them, this lasts for seven seconds or so.
>Deoxys
Alternate costume shiny, down B switches between forms which have pretty obvious differences (Speed is faster, Defense is harder to KO and takes less damage, Attack has a higher damage ratio) and all are weaker in the other 2 with normal being the balanced form. Final smash is Psycho Boost, which fires a purple ball around the stage (controlled by the joystick) that bounces back to the center (Where Deoxys is) after it hits something.
>Lucario
Alternate costume shiny, final smash is Mega Evolution, same as in Smash Bros 4.
>Zoroark
Alternate costume shiny, final smash is transforming into another fighter on the stage for twenty seconds.