Oh, geez, theres Pests in the rutabagas
At any time, you can pay 1 mana and remove 2 Charge Counters to get a 2/2 Spawn artifact creature token onto the battlefield
For individual cards and older booster packs and boxes, you will just have to gain a lot of experience and learn the nuances of real Pokemon products and then make educated purchases, ideally with a means of recourse if it turns out you were scammed (some kind of buyer protection program, etc)
However, as much as I'd like to tell you a sneaky card like Vela the Night-Clad is your best bang for your buck, that's simply not true
Blaine's Charizard is the undisputed king of both Gym Heroes and Gym Challenge, the single most expensive card across both expansions by a significant margin, and one of the most iconic Charizard variants in the entire history of the hobby
65 Card sleeves featuring Lugia