Wow. Quite the bump there.o_o But anyway, for me, it was most likely Larxene II. Parasite Cage was hard for me, too, but that was because the deck I used was terrible.>_>;
Awesome, it looks great for a DS game. I loved the original, so I'll definitely get this. Too bad it won't be released until next year, though.=/
Haven't played the original CoM, but for Re: CoM, probably Parasite Cage. But that was probably because I was using crappy attacks and sleights.=/ But after progressing through the game more, I'd say Larxene II was definitely harder boss.