Mega Mewtwo X and Mega Mewtwo Y are returning to Pokémon GO during the GO Fest 2026: Mega Finale event, bringing brand-new Adventure Effects and exclusive “plus” Charged Attacks to mobile raids, according to Niantic and event breakdowns from Leek Duck. Trainers can challenge Mega Mewtwo X in special raids on Saturday, September 5, 2026, and Mega Mewtwo Y on Sunday, September 6, 2026.
New Adventure Effects for Mega Mewtwo X and Y
Mewtwo unlocks unique Adventure Effects upon first learning its signature plus moves, with activation requiring both Mega Energy and Mewtwo Candy, as reported by Leek Duck. Once unlocked, these effects can be used even when Mewtwo is not actively Mega-Evolved. According to data and event details, Mega Mewtwo X’s Adventure Effect increases player damage against Mega-Evolved Pokémon in Mega Raids and Super Mega Raids while allowing trainers to break two shields at once during Super Mega Raids. Mega Mewtwo Y’s Adventure Effect reveals encounters with wild Pokémon that appraise at three stars or higher, causing high-stat targets to glow upon entering the encounter screen.
Exclusive Charged Attacks and Mega Mechanics
Eligible Pokémon reaching Super Max Level gain access to an additional Charged Attack while Mega-Evolved, regardless of their current Mega Level, per Leek Duck’s reporting. For Mewtwo, the granted attack depends entirely on the chosen form: Mega Mewtwo X wields the Fighting-type move Dynamic Punch+, while Mega Mewtwo Y commands the Psychic-type move Future Sight+. According to Hundo-Hunter, these plus moves follow the precedent set by Apex shadow legendaries, hitting harder than base moves while carrying secondary stat buffs. Niantic confirms that Mega Mewtwo X and Mega Mewtwo Y require separate, form-specific Mega Energy, meaning players must participate in raids across both weekend days to secure energy for both evolutions.
Mega Energy Collection and Event Schedule
Trainers can accumulate Mega Energy primarily by defeating Mega-Evolved Pokémon in Mega Raids, or by walking with a Buddy Pokémon from an evolutionary line that has previously undergone Mega Evolution. Hundo-Hunter notes that while players with banked Mega Mewtwo Y energy can prioritize X for versatile coverage—providing both a top-tier Fighting attacker and a Psychic option—raiding both forms is necessary because the X and Y Mega Evolutions do not share energy pools.
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