Regirock
When you come into mauvill city from the soulth there will be a house to your left.The man inside will give you rock smash.
Actually, you can't get HM Rock Climb on Pokemon Ruby, its only available in Pokemon Diamond, Pearl and Platinum.
there is no best place, but you can find numel, torkoal,slugma in grass near the sandstorm
smash the rock inside the rusturf tunnel that is preventing the 2 people from each other
You have to beat the 4th Gym and may will come to you and give something that will stop the Sandstorm.
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at a town
To get through the sandstorm north of Mauville City, you must defeat the Lavaridge City Gym Leader. Your rival will give you the Go-Goggles once you do.
Just search warp for pokemon ruby on google
you can find the legendary Pokemon regirock
after defeat fourth gym in verdenturf town. your rival will gives you goo-goggles. then you can enter he sandstorm
At the place where a sandstorm is...... you'll need two Pokemon to catch it.... which is wailord and recaith. Also a Pokemon that knows dig for the place where reirock is to open.