What is the game that has a whole bunch of characters from different games for ps2 in it on ps2?

Why don't you try the Super Smash Bros. Series? There's "Super Smash Bros." for Nintendo 64, "Super Smash Bros. Melee" for GameCube, and, the most recent title, "Super Smash Bros. Brawl" for Wii. I have enjoyed two of these three, and I hope you will, too.