What the suffixes actually mean
ex, GX, V, and the rest all mark special, more powerful Pokémon — bigger HP, stronger attacks, and a 'Rule Box' on the card. The trade-off is built into the game: when one of these Pokémon is Knocked Out, your opponent takes extra Prize cards instead of just one. More importantly for collectors, these are the cards that get the premium treatment — full arts, alternate arts, and gold versions — so the suffix is usually your first clue that a card is a chase card.
A quick timeline by era
Each suffix belongs to a specific era of the game, which is why you can roughly date a card by its mechanic. The original EX era ran 2003–2007; Diamond & Pearl had Lv.X; HeartGold SoulSilver had Prime and LEGEND; Black & White and XY brought back EX (plus Mega EX and BREAK); Sun & Moon introduced GX; Sword & Shield gave us V, VMAX, and VSTAR; and the current Scarlet & Violet era uses ex. Knowing the era helps you place a card and understand which others it shares a binder page with.
The two different "ex" cards (the big confusion)
This trips up almost everyone: there are two separate eras of 'ex' cards with nearly the same name. The original Pokémon ex (lowercase, 2003–2007) and the modern Pokémon ex (lowercase again, Scarlet & Violet, 2023–present) are NOT the same — different mechanics, different look, different values. There was also Pokémon-EX (uppercase, 2012–2016). The official rules are blunt about it: 'Pokémon ex and Pokémon-EX are not the same.' When buying or selling, always note the era, not just the letters.
GX (Sun & Moon, 2016–2019)
Pokémon-GX are 2-prize cards from the Sun & Moon era, each with a single powerful 'GX attack' you can use only once per game. This era is a collector favorite — it introduced Rainbow Rares, gold cards, and Tag Team GX (two Pokémon on one card, which give up 3 Prizes when Knocked Out). GX cards were discontinued when Sword & Shield arrived.
V, VMAX & VSTAR (Sword & Shield, 2019–2022)
The Sword & Shield era ran three tiers. Pokémon V are the powerful baseline (2 Prizes). Pokémon VMAX evolve from a V into a giant Dynamax/Gigantamax form with enormous HP (often 300+) — and they're the exception that gives up 3 Prizes when Knocked Out. Pokémon VSTAR also evolve from a V, give up 2 Prizes, and have a unique 'VSTAR Power' usable once per game (you can spot them by their pearlescent white-and-gold border). This era produced many of the most valuable modern cards, like the Moonbreon Umbreon VMAX alt art.
ex again (Scarlet & Violet, 2023–present)
The current era brought back the lowercase 'ex'. These function much like the old V cards — premium 2-Prize Pokémon — but with a twist: unlike V (which were all Basic), an ex can be a Stage 1 or Stage 2 evolution. The standard versions carry the Double Rare (two black stars) symbol, while the fancy full-card alternate arts are Special Illustration Rares. Tera Pokémon ex are a sub-type with crystal-style art.
What it means for collectors
You don't need to play the game to use this: the suffix tells you roughly when a card is from and that it's a premium card worth checking. The most desirable versions are almost always the full-art and alternate-art prints (Ultra Rares and Special Illustration Rares) rather than the plain ones. Pair this with the rarity symbol to gauge a card fast, and see our most-valuable rankings for what the top cards in each era actually sell for.