Which Pokémon gives Ditto the Rock Smash ability in Pokémon Pokopia?

In Pokémon Pokopia, Hitmonchan gives Ditto the Rock Smash ability.

Rock Smash lets the player break through certain rocky barriers and reshape parts of the terrain. The ability matches Hitmonchan’s identity as a Fighting-type Pokémon whose combat style is based on powerful punches.

Pokopia transforms familiar move associations into world-building mechanics. Instead of selecting Rock Smash only as a battle move, the player uses it to remove obstacles, expose routes, and alter the landscape while restoring the island.

Machoke is a plausible mix-up because it also contributes a strength-related ability in Pokopia, while several other Fighting- and Rock-type Pokémon are associated with breaking rocks across the wider Pokémon series. The specific source of Rock Smash in this game is Hitmonchan.