Wimp Out

When this Pokémon has more than 1/2 its maximum HP and takes damage bringing it to 1/2 or less of its maximum HP, it immediately switches out to a chosen ally. This effect applies after all hits from a multi-hit move. This effect is prevented if the move had a secondary effect removed by the Sheer Force Ability. This effect applies to both direct and indirect damage, except Curse and Substitute on use, Belly Drum, Pain Split, and confusion damage.