He doesnt appear in Hoenn as far as I am aware. (The only Main Generation games which he doesnt)
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You can't. Pokemon Emerald is just like Sapphire and ruby.
It is a item u can get from a prof that prof oak. it gives all six Pokemon in your team exp from the Pokemon you defeated
She is in the house behind prof oak's lab in pallet town.
You'll get Rock Climb from Prof. Oak when you have defeated all the Gym leaders in the Kanto region. Prof. Oak is at the laboratory in Pallet Town.
To get a starter from him you have to beat red at mt silver.