Arbitrary
Tranny Chaser
There any trick to beating Diabolos early on? I always have issues with that fight. Usually fight him with Laguna's group so I can hear the rad battle theme, usually takes me a few tries. And I think I usually get it close to the end of Disc 1, because I never have Encounter-None until some point in early Disc 2. Considering most people get him done way earlier than that, I'm probably missing something obvious.
He's weak to the gravity spells you can draw from him. Instead of draw - store you draw - cast. It can be messy but you can beat him the second you get handed the item that summons him.