you cant.you need to beat 4 gyms in Pokemon platinum: roark gardenia fantina and quake.then you will need to have 25 green shards.You will also need rare Pokemon fossil.To get at the shards get the explorer kit from the old man in vielstone.PS. you will also need to beat your biggest rival (the friend you made in the beginning of the game)Then go to the spear pillar to get there you will need to beat 15 galactic grunts,and wake up 3 legendarys:moltres, raquaza, and catch dialga in the spear spillar and go to sunyshore city to beat the 8th gym early with your new kirlia.Wou you skipped 3 gyms.Enjoy:)
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I don't think you can. You'll either have to trade with another game or maybe use a cheat. However, Pokemon Platinum has a kirlia. Hope this helps..............
Dawn stone on pearl/diamond/platinum
you have to evolve Kirlia at level 30 (Female Kirlia for a Gardivor, and male for a Gallade) To find Kirlia, go to Hearthome City and go south of it. Ralts and Kirlia may appear.
you can find a wild kirlia in the Pokemon mansion area but not in the Pokemon mansion
You can't find a Kirlia; you must evolve Ralts which can be found on route 102 in Emerald.