How do you get Raquaza in Ruby?

go to the sky piller after the elite four its on the way to the town that floots on the water by the way its lvl 70 so its real strong.

ok folo me not him first you beat the elite four after that go to pacifid log then surf off the right stay at the top by the rocks and you will find an opening go through till you get to a cave go in and up but you will need a mach bike to get through this is for ruby Sapphire and emerald thnx chris branda!