Frustration is an offensive Normal-type move. It is TM21, and can be bought in Greenpine City on specific days.
Frustration inflicts damage and has no secondary effect. The base power of Return is dependent on the friendship of the user. The lower the user's friendship, the greater the base power. The base power can be calculated using the following formula: Base Power = (255 - Friendship) / 2.5
The base power of Frustration varies between 1 (at the maximum friendship value of 255) and 102 (at the minimum friendship value of 0). The base power of Frustration is set to 1 if the formula outputs 0. If the user's friendship is 127 or higher, Return is stronger than Frustration.
A full-power attack that grows more powerful the less the user likes its Trainer.
Pokémon that learn Frustration
Any Pokémon can learn Frustration, except Formling.