You can't =(
Chat with our AI personalities
You can buy these at the mossdeep city pokemart.
Steven gives it to you in mossdeep city. You have to beat the mossdeep gym before you can use it. They are Psychic types so be careful.
You go to Steven's house in Mossdeep city. He's northwest of the Pokemon Center. When you enter, he'll give you HM08. HM08 (Dive) is exclusive to Pokemon Ruby and Sapphire and is obtainable in Mossdeep City from Steven who resides there. Steven
I know you can get a Sun Stone in Mossdeep City, at the Space Center. There's a person there that will give it to you.
You can find Devon in Mossdeep City he will give a Beldum. Note: Also works for Ruby and Sapphire.