Return

Return is a Normal-type charged attack. This attack is taught to a Pokémon that has been purified as a replacement for Frustration.

Return is retained by Purified Pokémon if evolved. Unlike Frustration, a Charged TM can be used to change it, and it would be overridden by event exclusive moves if applicable after evolution (even if a second charged attack is unlocked).

Trivia

 * Purifying a Shadow Pokémon will always cause the Charged Move in the first slot to be replaced with Return, even if Frustration was removed during a special event.
 * Return cannot be re-taught once removed, even with an Elite Charged TM.