Place the following characters on the same team. They will be able to do a simultaneous team attack:

Goku, Adult Gohan,and Gotenks
Goku, Super 2 Gohan, and Bardock
Perfect Cell, Super or Evil Buu, and Frieza
Super Trunks, Super Vegeta, and Super 3 Gotenks
Vegeta, Piccolo, and Goku