Nobody knows if shaymin is a hedgehog but she most likely is. She seems like she is a hedgehog that changes through stages but she might not be.
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Shaymin is a legendary hedgehog Pokemon that you can catch at route 224. You can get its sky forme by trading it to platinum. You need a special Nintendo event to get it though or you can use action replay, which you can buy off eBay. Hope this helps XD
Shaymin cannot evolve.
Shaymin cannot be found in Soul Silver.
You dont. you cant get shaymin in black. you have to transfer it.
You can't change Shaymin into Sky Form in Pokemon Diamond (that includes pearl). You can only change Shaymin into Sky Form in Pokemon Platinum (that includes Heart Gold and Soul Silver). You can get the Gracidea to change Shaymin into Sky Form.