His known Pokemon are Aron, and Aggron.
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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
Mossdip....
Steven will never appear in the Ruins of Alph.
HM08(Dive) can be found at Steven's house after clearing the Space Museum in Mossdeep City. Steven's house is north of the Mossdeep Pokemon Center.
You can receive it from Steven in Silph.