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You wouldn't calculate from Tyranitar's Base, check out Serebii's stats and it is pretty clear. At Lv 50 (which, they are set to in Battle tree, yes?) Tapu Koko's Speed (as you explained), would be an even 200 (394 at Lv 100). If Tyranitar has Max Speed, Jolly Nature, and 31 Speed EVs, then his...