A recent datamine for Pokémon Legends: Arceus has revealed code potentially relating to Mega Evolution, despite the ability being absent from the game's initial release, creating speculation it could be added to the game in the future. The inclusion of Mega Evolution in the reimagined Pokémon gameplay of Pokémon Legends: Arceus could be a great way to give players more battle options and bring back a popular mechanic. It could also give players more strategies when going up against powerful Alpha Pokémon when exploring the Hisui region.
Mega Evolution, a temporary evolutionary form Pokémon achieve using a Keystone and Mega Stone, was introduced to the series in Pokémon X and Y. While only available to a few dozen Pokémon species, the ability was popular for the creative new appearances given to older Pokémon like Charizard, and the powerful boost to attacks the capable Pokémon gained in battle. While Mega Evolution has been featured in several games, including Pokémon Omega Ruby and Alpha Sapphire and Pokémon Let's Go, Pikachu! and Let's Go, Eevee!, it was not brought forward into Generation Eight games like Pokémon Sword and Shield.
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While it appears that Mega Evolution has also been omitted from Pokémon Legends: Arceus, Twitter user Mattyoukhana has shared interesting finds from a datamine that may prove otherwise. Matt states in the Tweet, "In Legends personal data, every species has a count value indicating how many alternate forms it has. Species with Mega Evolutions still consider their Mega forms in their count and have entries associated with those forms. These values were stubbed in SWSH and are now re-added." Additionally, Matt also goes on to say
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