Only as a Pokemon not as a character.
No, Jack Skellington is not a playable character in Super Smash Bros. Brawl.
Super Smash Bros. Brawl is only available for the Nintendo Wii.
krystal is not a playable character in brawl
Pit
You can only install Super Smash Bros. Brawl on your Wii with a Super Smash Bros. Brawl disc.
No, Pichu is not a playable character in Super Smash Bros Brawl
Shadow is not a character in Super Smash Bros Brawl, unfortunately.
Midna is not a playable character in Super Smash Bros Brawl
What character?
Waluigi is not a playable character in brawl; however, he is available as an assist trophy from the beginning.
No, Jack Skellington is not a playable character in Super Smash Bros. Brawl.
Dark super Sonic is not a character in Super Smash Bros Brawl.
Super Smash Bros. Brawl is only available for the Nintendo Wii.
mewtwo is not in super smash bros. brawl however mew is a trophy character
Groudon is in Super Smash Bros. Brawl as a Poke Ballsummon, but not as a playable character.
There is not playable character called Jet in Super Smash Bros Brawl.
No, Sonic is only available in Super Smash Bros Brawl as an unlockable character