How do you get past the boulder at route 211?

To get past the boulder at Route 211 in Pokémon games, you need to have the move Rock Smash. First, you must obtain the HM for Rock Smash, which is typically given by a character in the game. Then, teach it to a Pokémon in your party that can learn the move, and use it on the boulder to break it and clear the path.