As often as you like during your turn (before your attack), you may take 1 Energy card attached to 1 of your Magnemites, Magnetons, or Dark Magnetons and attach it to a different 1 of your Magnemites, Magnetons, or Dark Magnetons
The buyer still has to provide a card of the same rarity they either dont want or need, while the seller receives a card they can resell, repeating the process infinitely
Seriously, its an amazing Background that fits into many strategies
Heres exactly what youll get based on the first Pokemon TCG Pocket pack you open: Genetic Apex Charizard If you choose the Genetic Apex Charizard pack , youll get Exeggutor EX
Imagine it in concert with a fourth turn Fabled Passage
After enough hits, it converts into Slicer, High-Speed Antagonist, a first-striking, hasty vehicle that swings hard and flips back at end of combat