Well forget what I said about this set possibly being a gimmicky set. We’ve received a photo of Team Magma Great Ball from last week’s CoroCoro Ichiban. Although it is hard to read, it appears to say the following:
Team Magma Great Ball – Trainer
Search your deck for a Basic Pokemon that has Team Magma in its name and a [F] Energy card, reveal them, and put them into your hand. Shuffle your deck afterward.
You may play as many Item cards as you like during your turn (before your attack).
Team Aqua Great Ball will probably have the same effect, but with Team Aqua Pokemon and Water Energy. Thanks goes to Franco T. for the translation! We should have scans and translations of the set within the next 48 hours, so be sure to check back!