first you must have moves dive and surf when you are at sootpolis city return to the real world and surf to route 128 you will see a blue thingy dive there and dive till you see a opening go inside there and use dive again wala the seafloor cabin
If you're asking what it is, it's earthquake. If you're asking where to find it, it's at the seafloor cabin.
you can get it in seafloor cavern
go to the seafloor carven
No.
In Pokémon Ruby, Earthquake can be found as a TM (Technical Machine) in the Seafloor Cavern, which is located near Mossdeep City. You can obtain it by navigating through the cavern and reaching the room where the TM is located.
you find them in cabin 1then you have to do some thing it's hard
go to victory road, sky pillar, cave of origin, and the seafloor cavern.
To get a Crobat on pokemon Ruby you must evolve your Golbat. If you do not already have a Golbat you can find them in many places such as: Cave of Origin, Meteor Falls, Seafloor Cavern, Shoal Cave, Sky Pillar, and Victory Road.
Pokemon ruby's version IS Pokemon ruby.
Arceus is not possible to find in Pokemon Ruby. It was released in 2007 with Pokemon Diamond and Pearl
You can find all kinds of pokemon.
You can't in ruby.