Stuck at bizzaro sephir, whats the tactic? He keeps healing himself, I tried to swap a bit between teams and still
On a 2 or 3 party fight, the Core has to be destroyed for the other parties.
2-Party
*) Fight starts, on Party A, destroy the head and swap
*) On Party B, destroy the head, arms, then Core. When Core is destroyed, swap
*) Back on Party A, destroy the head, arms, and then the Core; this prevents the heal from happening so the torso can be destroyed for the win
3-Party
*) Fight starts, on Party A, destroy the head and swap
*) On Party B, destroy the head, arms, then Core. Swap.
*) On Party C, destroy the head, arms, then Core. Swap.
*) Back on Party A, destroy the head, arms, then Core; torso is left without a heal so you can destroy it from there.
It's a big hassle though, so in the current version of the mod (2.0+) you can select whether to have a 1, 2, or 3 party fight. Using something powerful on Party B or C like Ultima, Pearl, Bahamut-ZERO, or KOTR would also speed it up; there's a checkpoint for Safer too so those Materia can be recovered for that battle if need be.