Q. What are staple cards?
A. Staple cards are cards that are the basic foundation of almost any deck to help it run smoothly.
In Pokemon, the only true staple cards are going to be Trainer cards such as Supporters, & Items.
Some staple cards have been reprinted over, and over making them relatively cheap to obtain, while some have only been printed once, making them quite expensive over-time!
Below is a list of cards you should collect first when starting out, so you have the fundamental cards necessary to build decks in each respective format.
*Remember to keep in mind what format you would like to participate in, and only collect the cards that are playable in that format. Also, keep in mind all cards in Standard are playable in Expanded, and Expanded Staples that are Black/White: Legendary Treasures, and older, are playable in the Legacy format.