Get 8 boosters and a Promo:
Beat Imakuni? twice(You'll find him in the clubs). You should have gotten 4 boosters each time. Find and beat him again, and he'll give you the promo of himself. But don't use it, it stinks.

Get Promos:
That guy who will trade you Slowpoke for Energys, do it, 'cause if you say no, u can't get that card.
Challenge Hall, when you win, you get promos.
After you beat Murray, go to that dude in the lounge thing, he'll give you a Mewtwo promo.
Others you need to card pop or trade with guys around the map.

Get Energys:
When you need some energys, go beat Sam in Mason Lab. He'll give u 2 boosters full of Energys.