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Evobeam
5 PP
80% Accuracy
Can target opponents or allies, cannot self-taught.
Causes target to immediately evolve to its next stage, including any potential Mega evolutions. As a result, the target becomes exhausted; it loses half of its maximum HP, and its ATK, SP. ATK, and SPD are lowered by 2 stages for the next 2 turns.
Pokemon who are hit with Evobeam but do not Mega Evolve as a result remain in their evolved state until the battle is over, when they revert back to their initial form. Once these Pokemon are successfully hit with Evobeam, they cannot be hit with it again for the duration of the battle. Furthermore, if a Pokemon cannot evolve anymore and cannot Mega Evolve, then Evobeam will have no effect.
If a Pokemon undergoes Mega Evolution as a result of being hit with Evobeam, then it can return to its initial form by switching out of battle and then switching it back in. However, this will render that Pokemon susceptible to the effects of Evobeam again.
Previously unseen evolutions and Mega Evolutions that result from using Evobeam will be recorded in the Pokédex after the battle is finished.