Question

I was thinking of breeding Counter into a Scyther,but will it OHKO a high Defence Pokemon like Steelix or Aggron?even after a couple of Swords Dances?

Answer 1

Sword Dance has nothing to do with Counter - It deals twice the damage Scyter took. It is about HP and only HP. Attack does damage (AttXDef) - lost of HP. Then, Countering it would deal 2x los of HP

Comments

Will it OHKO the foe?

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Look: Scyther took 100 HP from physical attack. Scyther's Counter will cause 200 HP loss. I cannost say. Train it in HP, make it's Defense low, and you will maximalize Counter's power

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Remember tho, counter only counters Physical moves.