Obviously shion should avoid this thread so she doesn't get spoilers
My final team was usually Crono, Frog and Magus, though I liked using Crono Lucca and Robo as well.
In Cross, my favorite team is pretty much the CC equivalent of my CT team of Serge, Glenn, and Guile, though I liked switching in Kid and Pierre (with full hero gear) in for a mix-up.