deep dark crater 10th floor..veronica
get either the mystery part or secret slab, then take one of them with you to Concealed Ruins (I think). Raikou will appear on the 20th floor.
you can't the only way to get him is on Pokemon firered and leafgreen or Pokemon colloseum
concealed ruins with secret slab or mystery part
raikou cannot be caught on Pokemon ruby
Mount Avalanch floor 20
to catch Pokemon you have to obtain raikou palls
Raikou is on floor 20 in Concealed Ruins. Bring a mystery part or a secret slab and keep it in your bag. If you can, bring a golden mask and make your leader hold it. A golden mask makes making friends easier. Your leader should be your starter pokemon, if you want to recruit Raikou. Hope I helped!
Mystifying Forest 13 th floor.
with a secret slab or a mystery part you can get Zapdos = amp plains floor 7 Lugia = surrounded sea floor 18 Ho-Oh = Mt.Mistral floor 19 Deoxys = Shimmer hill floor 17 Latios = Midnight forest floor 24 Raikou = Concealed ruins floor 20 Latias = happy outlook floor 10 Mewtwo (darkness) = Aegis cave floor 5 Celebi (time) = Treeshoud forest floor 10 and to get a mystery part =2WQ 6#86 QWH5 @0F8 C52F H66&
Raikou is only found in firered and leafgreen if you chose squirtle as your starter Pokemon. Or you can get the purified raikou from Pokemon colosseum.
You cant get raikou in Pokemon diamond or Pokemon pearl.But you can get him in a gba Pokemon game and transfer him to your Pokemon pearl or diamond!
You can't find raikou in ruby.