Black Waltz + Sealion (only the first time i played it though).
Fighting 2 enimies with 1 character is hard on first go.
Oh, God, tell me about it. I kept dying untill I got the bright idea of killing the Black Waltz FIRST! Then it was easy. But I despise Meltigemini. Especially since the bastard Virused my ENTIRE FLIPPIN' PARTY!!! God, I hate that thing.