An Assist Trophy is an item in Super Smash Flash 2 that, when grabbed, summons a random non-playable character to aid the player who summoned it. Assist Trophies work nearly identical to Poké Balls. However, no Pokémon come out of them, and once an Assist Trophy is grabbed, it is automatically activated, assuming the holder is standing on the ground, and not in a jump, attack, or hitstun. Basically they are "guest" characters separate from the playable roster.