In Cross, it was Serge, Kid/Harle, and...whoever else. I definitely used Fargo when Kid wasn't in the party, though, since it's so important to have someone who can steal from bosses.

In Trigger, it's all about Chrono, Marle, and Ayla. Aura Whirl, Falcon Hit, Cube Toss, Final Kick, yes, yes, yes.