If you mean delete a HM move that has already been learned, you can go to the Move Deleter's house which (I think) you can find in Lilycove City. But if you meant delete the whole HM item, it cannot be done because it is an important item.
To delete any HM's inside of Pokemon Emerald, Ruby, or Sapphire, you must go to Lilycove city and go to the MOVE DELETER'S house. Once you're there talk to the old guy and make him delete whichever move you want. (this does work on HMS)
The only way to delete moves is through the Move Deleter, which should be in Blackthorn City.
u go to the move deleter at fallorbar town.you need a heart scale.
you need some HMS such as dive strenght and rock smash
The Move Deleter will delete any move, including HMs. You can find him in a house near the Shopping Department in Lilycove City.
You talk to the move deleter in Lilycove City.Check all the houses for him.Talk to him and he will delete any of your pokemon's moves!Even HM's!!!
To delete any HM's inside of Pokemon Emerald, Ruby, or Sapphire, you must go to Lilycove city and go to the MOVE DELETER'S house. Once you're there talk to the old guy and make him delete whichever move you want. (this does work on HMS)
The move deleter, in Lilycove City.
in bushes,with people, in caves, and hidden
for your party, you'll need Pokemon that know most of the HMs as they are used often
The only way to delete moves is through the Move Deleter, which should be in Blackthorn City.
In Canalave City, the house above the Poké Mart.
go to fuchsia city Pokemon center to the left of that is the move deleter. you can delete HM's there
u go to the move deleter at fallorbar town.you need a heart scale.
you need some HMS such as dive strenght and rock smash
if i remember correctly (and i think i do!) mew can learn any TM or hm :)
There are no cheats on any Pokemon games you have to use a gameshark but they can delete your data!!