First you go north from Mauville City until you are on route 112. Then you go into the building next to the Fiery Path. Talk to the lady with green hair and she will ask if you wish to go into the cable car. You sy yes and you go up to the top of Mt. Chimney.
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The fourth badge. It's in Lavaridge town. You'll need to use the cable car north-west of Mauville.
you need the ruby and the sapphire on island 1 so the machine works and you can trade to ruby and sapphire
You can only get an "onix" in Pokemon sapphire if you have a Pokemon version that has an onix then use a linking cable with other GBA to trade it and then you'll have an onix but "onix's" data can't be stored in your pokedex.NOTE:You can only trade with a Pokemon version that have the same region as your Sapphire has;HOENN REGION.
I hear you can trade from crystal to sapphire. You have to have two gameboy advances, a gba link cable, and in crystal you have to go to the time machine.
The Mystery Gift in Pokemon Ruby, Sapphire, Emerald, FireRed, and LeafGreen all use the wireless adapter that goes into the GameBoy Advance to obtain special Nintendo events and/or DLC. (Downloadable content) The link cable was only used for the Mystery Gift in Pokemon Silver, Gold, and Crystal.