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And it's done. Transferred my lvl 82 Gengar from my Jap Blue save over to Crystal and kicked Red's ass with it.
My Crystal's Exeguttor also helped for Espeon and Snorlax: Leech Seed + Sleep attacks go a long way.
Didn't need to use items, and in a way, Red is easier here than in HGSS because he doesn't use items, or maybe I just got lucky that he didn't.