how to get two moonstones in pokemon platinum

[Stronghold]

I need 2 moon stones how I get em?

[raydawg11595]

if you have a pokemon holding a moonstone, take that, or trade with someone who has a pokemon holding a moonstone. i found mine held by a wild clefairy i caught.
if it is for breeding a cleffa, you only need one moonstone, because clefable can breed with a clefairy for a cleffa.

[Zidarose]

You can find them trekking around Sinnoh in Eterna City and with the Drowsing Poketch app in Mt Cononet, from Wild Pokemon (Cleffa and Clefairy) and by digging in the Underground.