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Got a mini heart attack when I saw none of the mons I've caught could learn Cut and thought the run was over. Turns out you don't actually need Cut in Emerald and I never knew. I am honestly surprised neither Mudkip, Dustox nor Marill could learn it, I always assumed they could.
Still, I am probably going to teach it to someone as soon as I can to get all the extra items and EXP.