How to Forget a HM Move in Ruby
Like in all other "Pokemon" games, each Pokemon in "Pokemon Ruby" can only know a maximum of four moves at a time. If one of your Pokemon already knows four moves and you want to teach it a new one, you will need to make it forget one of the old moves. Most moves can be forgotten simply by learning a new one; however, some moves, such as all moves learned through a Hidden Machine, can only be forgotten by visiting a special type of non-player character called a Move Deleter.
Instructions
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1
Teach the HM move you want to forget to a different Pokemon. Until you do this, the game will prevent you from making the original Pokemon forget it.
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2
Travel to Lilycove City with the Pokemon you want to forget the HM move in your party.
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3
Travel to the small house immediately to the right of the Lilycove Department Store, the large building found in the north of the city.
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Enter the house, and speak with the man inside. Select "Yes" when he asks whether you want him to make one of your Pokemon forget a move. This will open a list of the Pokemon you currently have in your party.
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Select the Pokemon you want to forget the HM move from the list. After a short dialogue, a list containing the four moves that Pokemon currently knows will open.
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Select the HM move from the list; then select "Yes" when asked for confirmation.
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