Deck Building Basics in Pokémon TCG Pocket: The 20-Card Backbone

Every legal deck follows exactly three constraints: 20 cards total, a hard cap of 2 copies of any single named card, and zero Energy cards in the deck itself — Energy comes from the Energy Zone instead, generating 1 automatically every turn from 1 to 3 types you choose when you build. Beyond that, the deck can mix Pokémon and Trainer cards (Supporter, Item, Tool, Stadium) freely. There's no mulligan rule; your opening hand is guaranteed at least 1 Basic Pokémon, but there's also no deck-search effect that reliably finds a specific card — your starting 20-card list is close to the only shot you get during a match, which is the single biggest structural difference from the paper Pokémon TCG.

Across every Pokémon card printed for Pocket so far, roughly 55% are Basic-stage, with the rest split between Stage 1 and Stage 2 evolutions — and that split isn't an accident of card design, it mirrors how decks actually need to be built. With only 3 bench slots (down from 5 in the paper game) and zero draw-search tools, running too few Basics risks a bench that never fills up, or worse, evolution lines you can never complete because the Basic underneath them never showed up. A safe starting approach for a new deck is to weight it toward Basic Pokémon and treat every Stage 1 or Stage 2 line you add as a commitment that needs 2 copies of the Basic underneath it to be reliable, not just 1.

Because there's no Energy card to draw, your only source of power is 1 automatic Energy per turn from the Zone — which makes a card's attack cost function like a built-in timer. Looking at real attack costs across the card pool, Basic Pokémon average about 1.7 Energy per attack, Stage 1s step up to roughly 2.1, and Stage 2s average close to 2.6 — and retreat costs climb the same way, from about 1.4 for Basics up to 2.0 for Stage 2s. Stack a deck with too many Stage 2 attackers and you're not just waiting longer to evolve, you're waiting longer every single turn to actually pay for their attacks, since the Energy Zone still only hands you one per turn regardless of what's on your bench.

Trainer cards — Supporters, Items, Tools, and Stadiums — don't cost Energy to play and exist to smooth out exactly the problems above: drawing extra cards, healing, searching for a specific Basic, or boosting an attack. They still count against your 20-card total and the 2-copy cap per name, so every Trainer slot is a Pokémon slot you didn't run. A first deck doesn't need to be Trainer-heavy to function, but leaving a few slots for a card-draw Supporter is usually worth more than a third copy-adjacent Pokémon you'll rarely need both copies of at once.

The average Energy cost by evolution stage, from our card database, is the number this whole article is built around: