heres a gamefaq link to answer your question. http://www.gamefaqs.com/portable/gbadvance/file/563596/25143
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you cannot catch the 3 regi's in Pokemon platinum you have to catch them in Pokemon emerald then transfer them to Pokemon platinum. thnx
First you need the special event Regigigas in order to activate Regirock, Regice and Registeel. All 3 of them are in different caves scattered through the Sinnoh region in Platinum. Regirock is in a cave within Route 228, Regice is in a cave in Mt. Coronet which is near the exit to Route 216 and Registeel is in a cave within Iron Island.
get national dexmigrateand you can getzapdos, articuno, and moltresregigigas and heatranto get the 3 birds1. go to eterna city2.talk to oak3. search for them (they run away)to get regigigas1. migrate regi rock, regi ice, and regi steal2.put them in your party3. go to snowpoint templeto get heatran1. go to stark mountain (route 227)2.defeat team galactic3. go back for heatranto get national dexcomplete the sinnoh dexto migrate1.put ruby,emerald,sapphire,leaf green, or fire red in gameboy slot2.select migrate on opening screen3. choose 6 Pokemon from GBA game4. start game and go into pal park
Well there is only about 3 Pokemon that evolve with the sun stone and 2 in Pokemon sapphire gloom and sunkern which turn into bellossom and sunflora.
There are 4 ways: 1. Migrate them from Emerald/Sapphire/Ruby. 2. Trade them with a friend. 3. Do the same as number 2, but do this, then trade them back and then search for each regi on the Global Trade Station. 4. Trade them from platinum with someone that has a movie Regigigas.