It depends Mew drops a CD for music if you haven't already gotten them all If you have gotten all of Mew's songs, it won't be in any Pokeballs
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There are 25 character in Super Smash Bros. Melee and Mew is not one of them. However Mew is a Pokeball.
Mew is not a playable character in melee
Super Smash Bros., Super Smash Bros. Melee, Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS/ Super Smash Bros. for Wii U, Super Smash Bros. Ultimate.
Super Smash Bros., Super Smash Bros. Melee, Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS/Super Smash Bros. for Wii U, and Super Smash Bros. Ultimate.
Only as a Pokemon not as a character.