You can't
take the Pokemon to a guy in lilycove city and he makes them forget
in blackthorn city there is a house full of people that can teach moves to pokemon, make pokemon forget moves etc;
There is a move deleter who can make pokemon forget HM moves.
In all the Pokemon games, there is a Move Deleter person. Talk to him to delete moves.
The Move Deleter in Pokemon Ruby, Sapphire, and Emerald is found in Lilycove City.
You send it to day care until it goes up 12 levels.
Go to the Move Deleter in Canalaeve City. He will make your Pokemon forget any moves and is the only way to forget HM moves. If you want a move back (not including TMs/Hms) go to the Move Relearner in Pastoria City with a Heart Scale, which can be found underground.
well u fly to canalave city and u go 2 or3 houses down and go inside and there will be a guy talk to him and he will forget your pokemon's moves for FREE! HMs included! hope i helped!
In order to learn a new move, the Pokemon must forget moves first. Then, it has to level up and it will learn the move it should have already learned.
uhh teach it a differant move over it(yeah its fun to learn HA HA) You can also go to pastoria city and then go into a house in one house there is a man who makes your Pokemon forget moves
you have to go to the town where you go to iron island and you go down from the poke center and their should be about two houses one of them is it
I usually make my Pokémon forget status moves, so if your Lanturn knows Charge or Withdraw, those would be good moves to make it forget.