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Mega Evolution is a temporary battle form activated by a Mega Stone and a Key Stone. It boosts stats and can change type or ability for the duration of the battle.
Primal Reversion is a special transformation for certain legendary Pokémon triggered by a held item. It is a battle only change that boosts stats and can alter abilities.
There are 98 Mega eligible Pokémon listed. Examples include Venusaur Mega, Charizard Mega X, Charizard Mega Y, Blastoise Mega, Alakazam Mega, and others.
Mega Evolution applies to many different species with Mega Stones, while Primal Reversion is limited to specific legendaries. Both are temporary battle forms, but Primal forms use their own items and have unique ability changes.
Only one Pokémon on a team can Mega Evolve per battle, and the change happens once the trainer triggers it. The Mega form lasts until the battle ends or the Pokémon faints.
No. Mega Evolution is temporary and the Pokémon returns to its normal form after the battle.