If you go onto www.neoseeker.com find Diamond then click the button that says action replay and serch the cheats there are a few about it.
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In the Oreburghe mining museum at the top left corner of the city.
There arent any cheats, but after you beat the elite four, you go to the mining museum in oreburgh city. there, you replace the "XXX" with the Pokemon name and number like this: Replace "XXX" with "Bulbasaur001" and I will receive Bulbasuar.
The Museum is located in the top right corner of Oreburgh City. Hope this helps!!! :)
there is none because it is not a sinnoh pokemon.you might be able to get him or her because i have a charizard that i traded for and it says met at mining museum
If you have a copy of Pokemon Soul Silver then click on Mystery Gift, Nintendo WFC, then you have the Enigma Stone,, go to Pewter Museum and give it too Steven, you get the Soul Dew... To Get it in Platinum, you need to do those things in Pokemon HG or SS, then get the soul dew, attach it too any random Pokemon, trade it over to Pokemon Platinum. Hope I Helped :)