First go to Slateport city and talk to the crowd then go back to Lilycove and surf off the west coast to find a team magma grunt. Surf north from there into the base. Progress through until you find that team magma admin. battle it and surf to Mosdeep city.
lots of training. dont face here as soon as you see her. go out and train for a bit. when she had lvl. 20 pkmn, i had level 43 pokemon. i killed her! so wai, and then youll get her.
All the Pokemon past Turtwig are unavailable in Ruby.
skill
You cannot get a Gallade on Pokemon Ruby. But you may get one in Pokemon Diamond or Pokemon Pearl. - Badminton
beat the grunts
You can't
Just past victory cave
beat the people in the wether instute
well it depends what pokemon do u have and what moves do they have.
you get it from may/brendan.
The rival in Pokemon sapphire, ruby and emerald is brendan or may. It depends if you a boy or a girl at the beginning (boy=May , girl=Brendan).
U will need a water Pokemon like tenticrul
you cant find him in Pokemon ruby instead you find may.