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In Re:CoM, I would have to say the hardest boss (maybe the only hard boss) is Marluxia. If you build your deck right, all the other bosses are simple. Organization XIII members and the Riku replicas rely solely on speed. As soon I saw that I just made a deck with a lot of stunning attacks and Lethal Flame, they didn't stand a chance. I think the only bosses other than Marluxia that even got a hit on me were Vexen and the second Larxene. Cheap, yes.
Actually, the trick to R/R Trickmaster are the low cards themselves. Trickmaster takes forever to make an attack and that will hand you over time to search for a card that can duel. Trickmaster has crud cards to duel and that's how you kill it. Also, never do sleights.
Riku Replica's 4th form was hell, it took me 6 tries, Dark Aura completely beasted me, and I didn't dodge his dark firaga attacks well enough, and that's really easy to dodge just with the right timing.