To delete an HM move, you must go to the move deleter in Fushia city.
He can delete any move you want to... even a HM move!
but don't forget that after that HM is deleted that Pokemon only has 3 moves left so teach it another move!
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Well not every Pokemon can learn all the hm moves, try tropius.
the move deleter in canalave city :) =)
There is no move deleter in Pokemon Blue - however, there are Gameboy Genie and GameShark codes to aid in the removal of HM moves from the early games.
there is a move deleter in fuchsia city (the house to the left of the pokemon center)
You cannot delete HMs in Yellow. It is said in the game that HM moves are permanent. If you will need to use HM's such as flash and cut that are not too useful in battles, just teach it to Pokemons that you will not use in battles so that your main roster's skills will be strong moves.