Ok this is a hard question and shouldn't be answered because this question is a question you should find the answer to on your own plus I checked my pokedex looked around and all the rare Pokemon have unknown areas sorry
You can get three rare candies in Pokemon ruby sapphire and emerald
Solrock is not such a rare Pokemon but you can only get them in ruby/emerald
There are a few rare Pokemon you can get in the safari zone they are pinsir, wobuffet and girafarig.
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You can get the regice, regirock, or registeel.
Relicanth is rare. They'll only appear if you go underwater on Routes 124 and 126.
You can get three rare candies in Pokemon ruby sapphire and emerald
The Fiery path dungeon is located on routes 111 and 112 in Pokémon Ruby. Players can get rare items in the Fiery path.
...and?
Solrock is not such a rare Pokemon but you can only get them in ruby/emerald
You catch them. Or trade for them.
n e where
the routes left of pacifidlog town
Groudon is rare and you get him just by following the story line. The only other "rare" Pokemon I'm aware of in Ruby would be Relicanth, a rock/water type fish Pokemon that can be found underwater.
You can obtain Horsea by fishing on Routes 132, 133, and 134 in Pokemon Ruby.
Rare Pokemon come randomly when you're in the grass or cave.
use the itemfinder