The trio in ruby, sapphire, emerald, is Regice, Registeel and Regirock. In Pearl, Diamond and Platinum Regigigas is released to those who trade the 1st 3 regis into their P/D/Pt.
Below I have added a link on how to get them.
You can get three rare candies in Pokemon ruby sapphire and emerald
...and?
Solrock is not such a rare Pokemon but you can only get them in ruby/emerald
n e where
You catch them. Or trade for them.
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.
Rare Pokemon come randomly when you're in the grass or cave.
use the itemfinder
There are a few rare Pokemon you can get in the safari zone they are pinsir, wobuffet and girafarig.
i think there's none
Pokemon ruby sapphire and emerald
OK the rare Pokemon are groundon, i think there's the 3 regies regirock,regiice,registeel. And you can also get this strong Pokemon named milotic. But you need to evolve it from feebas though. hoped this helped!:)