I'll be nice and won't take advantage of a free action. ^_^
Anyway, you can't use Shell Smash twice:
Shell Smash: The Pokemon breaks its shell in half, greatly increasing its mobility and offensive ability at the cost of its defenses. This enables it to move more freely, raising its Attack, Special Attack, and Speed by two (2) stages each. However, as the shell is broken the Pokemon's Defense and Special Defense decrease by one (1) stage. These boosts and drops for the duration of the time the Pokemon is active. The Pokemon will revert to normal if it is switched or forced back into its Pokeball. The Pokemon cannot use Shell Smash if the effect is already active.
Feel free to edit your actions!