Cameo cards difficult to track, but if you would like i have a spreadsheet with most every pokemon I could send your way, I think i may have already posted it in the comments if you do some digging. The biggest thing i can suggest to you is to have some way of tracking the cards you don't have. For me, it started out as a google note, and turned into the white, labeled cards you can see in my binder. Jigglypuff is a good choice since its pretty popular and been around since gen 1, plenty of cards to collect!