You cannot find Misdreavus in Pokemon Ruby. To get a Misdreavus you need to trade for one from a copy of Pokemon LeafGreen.
Pokemon ruby's version IS Pokemon ruby.
you cant find him in Pokemon ruby instead you find may.
there is no cerulean cave in ruby
Well... Not to overcomplicate things, in the Eterna forest...
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You can find lugia in navel rock
action replay,gameshark,or codebreaker.
you find it in the team aqua hideout
there's no elekid
Sadly, you can't catch Groundon is the Sapphire Version, however you can in the Ruby version, you will find him in the same place you find Kyorge in the sapphire version.
Mew does not exist in Ruby version.
There is not a location for detox on Pokemon Ruby. Players can detox Pokemon on this version by refreshing the game.