Often in the core series games, breakable rocks may present an obstacle to the player's advancement past a certain point (requiring the acquisition of a Badge to be able to use Rock Smash) or block the way to an area or item.
Generation II
Generation III
Ruby, Sapphire, and Emerald
In Pokémon Ruby, Sapphire, and Emerald, breakable rocks on Route 111 block the player's advancement north until they have received the Dynamo Badge.
FireRed and LeafGreen
Generation IV
Diamond, Pearl, and Platinum
In Pokémon Diamond, Pearl, and Platinum, no wild Pokémon appear when rocks are broken. Breakable rocks in the Ravaged Path also prevent the player from reaching Floaroma Town until they have received the Coal Badge.
HeartGold and SoulSilver
Generation V
In Generation V, Rock Smash is not a field move. There are no breakable rocks like in other games, but in Black 2 and White 2 in Clay Tunnel, the player can help clear a section of boulders if a Pokémon in their party knows Rock Smash.
Generation VI
Pokémon X and Y
In Pokémon X and Y, when using Rock Smash on a breakable rock, there is an even chance that nothing will happen afterwards, a Pokémon will appear, or an item will appear.
Pokémon Omega Ruby and Alpha Sapphire
In Pokémon Omega Ruby and Alpha Sapphire, breakable rocks on Route 111 block the player's advancement north until they have received the Dynamo Badge.
When using Rock Smash on a breakable rock, there is an even chance that nothing will happen afterwards, a Pokémon will appear, or an item will appear.
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