Oh I see what's going on there. I was using a Rank 4 Def for Empoleon when it actually was Rank 3 (my bad), but the 1.75 multiplier only applies to stat boosts, not type effectiveness. The calculation should be (9 [Sky Uppercut] + 3 [STAB] + 3 [Stat])*1.5 [Type] = 22.5~23. The combo should be (15 [Combo] + 3 [STAB] + 3 [Stat] + 3 [crit])*1.5 [Type] = 36. If I had used Swords Dance or something, the 1.75 would come into play, but I didn't, so it doesn't. Nothing should ever be multiplied by 1.75 unless it is a multi-stage stat boost, and those are added after everything else.