jewelery
coins
medical equipment
lab equipment
and alot of other things
Read more: http://wiki.answers.com/What_are_some_things_made_of_platinum#ixzz1H8lFScW2
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You can do lots of things and almost anything
dnt worry about wat he said platinum is fully hackble go to gbatemp.net and u can find some made hacks like platinum,or Pokemon platinum enhanced edition
You can buy them at the blue store things - not at the first few.
You can do that by either using the Poketransfer on route 13 or the Relocator to transfer your pokemon from Platinum, Diamond, Pearl, Heartgold, and Soulsilver. But you need another DS to make either of these things to work.
No for some reason the makers of Pokemon this time have made it so you can not battle with older games such as pearl, platinum, dimond, or heart gold or soul silver.