In Melee,Jiggles was ALLOT better than Mewtwo.The only reason Jiggs got into Melee was because of N64. Only reason s/he was in 64 was because of the hype she gathered for about a month. For some lovely explicit reason, they decide to trash the Legendary and go with ol' puff-alot in Brawl.
Honestly, big mistake. I doubt anyone would have cared of Jiggs got the boot up her pink arse.
She got in Smash64 because at the time,she was major in the Pokemon anime,and I dont see how you can say Jiggles got Mewtwo kicked out of brawl,if anything you could say its Lucario,even if they onyl share one move.