The Pokemon tamed by the Magma Stone is Heatran, HOWEVER you need to see all 210 Pokemon in that Region. Now how I did this was on R4, (Revolution For DS) so you'd be awfully lucky to complete the National and the Sinnoh Dexs.
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finding the magma stone
its magma stone and its in stark mountain after you beat the game
its magma stone. you get it on route 18 AFTER you talk to a sinnoh gym leader. No, cynthia does not count.
You go back to the Survival Area and go to his grandfather's house (the house on the left of the Pokémon Centre) and speak to him, then to Buck. Buck will then leave the house. When you go back to Stark Mountain, and into the room the Magma Stone was in, there will be Heatran in it's place, ready to be caught. Best of luck.
Pokemon requiring a stone to evolve:Eevee - Thunder stone, Jolteon (you can't find this Pokemon in Ruby) Eevee- fire stone, Flareon (you can't find this Pokemon in Ruby)Eevee- water stone, Vaporeon (you can't find this Pokemon in Ruby)Sunkern- sun stone, Sunflora (you can't find this Pokemon in Ruby)Jigglypuff- moon stone, WigglytuffSkitty - moon stone, DelcattyNidorino- moon stone, Nidoking (you can't find this Pokemon in Ruby)Nidorina- moon stone, Nidoqueen (you can't find this Pokemon in Ruby)Growlithe- fire stone, Arcanine (you can't find this Pokemon in Ruby)Gloom- sun stone, BellosumGloom- leaf stone, VileplumeStaryu- water stone, StarmiePikachu- thunder stone, RaichuLombre- water stone, LudicoloNuzleaf- leaf stone, ShiftryVulpix- fire stone, NinetalesHappiny- oval stone Chansey