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All Pokémon with Aftermath can learn Explosion.
Pokémon with Aftermath
As a natural ability
|If any of the Pokémon were introduced before the generation that Aftermath was introduced in, then they will not have it as a natural ability until then.|
|Hidden abilities were not introduced until Generation V, so if any of the Pokémon were introduced before that, then they will not have Aftermath as a hidden ability until then.|