During Emerl's story, enter 75619 in the Sonic Team building password screen.
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When you are in the map area, like Emerald Town, and the other places, not during a battle, press the Right Trigger. Then go to Edit Skills, and go to the Attack column and find Ground Power. Then, just pick which Combo Card you would like to use. Personally, I would suggest Sonic Combo. He does a series of punches and kicks and, lastly, does a Sonic Wave (I think that is what it is called, not positive though) which helps dodge E-102r's explosion.
no super sonic
There is no Sonic Pokemon card. Sonic the Hedgehog and Pokemon are two different series that have never crossed over with each other.
Well it's all a matter of luck, I only have 71% of the whole collection, but the best way to start is whenever you get a chance to battle Emerl (against) use the move you want him to learn about 5 times in a row to get the card for that move.
It saves by itself as long as you have a memory card inserted.