Shell Smash is a Normal-type move that boosts the user's Attack, Special Attack, and Speed by two stages while lowering the user's Defense and Special Defense by one stage.
Certain battle rules prevent Pokémon from knowing both Shell Smash and Baton Pass.
- Smash-Pass Clause: Pokémon that have both of the moves Shell Smash and Baton Pass cannot be used.
- Speed-Pass Clause: A Pokémon cannot have Baton Pass, a move/Ability that boosts Speed, and a move/Ability that boosts another stat. This includes Shell Smash.