From the introduction:
Recently, the phenomenon known as Mega Evolution has been discovered. This “extra” evolution, if you will, temporarily grants Pokémon an extra burst of Power for one Scene by transforming them into stronger versions of themselves. And even Alolan Pokémon forms can Mega Evolve into their respective evolution!
Mega Evolutions can change a lot about a Pokémon: Appearance, Stats, Skills, Abilities, Capabilities and even Type! Some Pokémon have been known to take drastic changes, while others are merely more powerful versions of their un-evolved selves.
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