How do you learn the HM rock smash in Pokemon Tower Defense 2?

In Pokémon Tower Defense 2, you can learn the HM move Rock Smash by progressing through the game and finding the move tutor. Typically, you need to locate a specific character in the game who teaches this move to eligible Pokémon. Be sure to have the appropriate Pokémon in your party that can learn Rock Smash, and interact with the tutor to obtain the move.