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Thank you for reffing the round vs mowtom :) but when you fixed icicle crash, you still didnt add in the crit (you rolled yes for crit). IC should be doing (8+3+3+4+(7.5-.45)) = -21HP
You DO know you could just UC dump on Magikarp's EC, right? I don't usually put UC on EC, but I did that with my Chansey because Happiny falls in the same boat as Magikarp: Completely untrainable.