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I think we can all agree Mega Sceptile's ability is a bit on the strange side, but I think I've got it figured out.
He's going to be Ash's Mega in the show. Lightningrod makes him a perfect partner for Pikachu in doubles, lets Ash have a Mega without needing to invent Pikachuite, and gives Sceptile the typing he needs to fight on even footing with Alan's Charizard.