1. Go to the Move Tutor: You can find Move Tutors in various locations throughout the game. They allow you to replace a move on your Pokémon with a different one.
2. Select the Move to Replace: Choose the move you want to replace from your Pokémon's move list.
3. Choose the New Move: The Move Tutor will offer you a selection of moves that your Pokémon can learn. Choose the one you want to replace the old move with.
Important Note: Some moves are only available through specific Move Tutors or at certain points in the game. You can find out more about where to find specific moves in online guides or wikis.