go to the bottom of the waterfall at the Pokemon league.
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it's ZAP PLATE and you find it underground
Yes, in the old chateau, but it is called the "insect plate".
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.
Finding the Insect Plate in Pokemon Diamond requires the use of the HM Cut. It is in Eterna Forest hidden in the wall to the right of the Old Chateau.
you can get an electric next to the wind works