I'm going to go with the cast of the Tactics games, especially Advance and A2.

While they may not have Auto-Phoenix (an ability I never used anyway, since it depends on consumables), they have everything else they need. Easily the most versatile and powerful of the teams. Between some of the easiest access to crippling status effects (Zombie, Stone, Instant-KO, Sleep + Doom, and the most accurate Stop in the series), and the utterly insane versatility they have, I think they could stand up to pretty much anyone.

Especially the Viera. Camouflage makes them invisible in the melee, until they take action. They can sit and wait while the big summons and flashy attacks play out around them, while sniping individual units with moves like Rockseal or Last Breath, then vanishing back into the shadows.

Plus, if you toss fighters into the FF Tactics systems, you realize that a lot of the most powerful Limit Breaks have range issues.