So let's say I have a Mega Absol vs Xatu or something. Both have Magic Bounce. What would happen if Mega Absol used Will-o-wisp?
Mega Absol would be affected by it and receive a burn. If both pokemon have Magic Bounce, it will only reflect the move once- causing the user to be hit.
Source: Bulbapedia- If two opposing Pokémon have this Ability only the target's Magic Bounce will reflect the move (i.e. the move will only be reflected once).
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1Do note that Will-o-wisp's accuracy is still taken into effect when Magic Bounced - so it has a chance to miss the user – Robotnik♦ Jan 26 '14 at 16:39