The Pokémon Trading Card Game has many old and valuable cards, but only recent collections (like Pokémon Sword & Shield) are allowed in official tournament play. This information may disappoint owners of powerful cards and classic collections, but the regulation of legal cards is vital to competitive Pokémon TCG events. They both read "shuffle your hand into your deck and draw 6 cards".
You can't run 4 Cynthia and 4 Professor Oak's Research in the same deck. Moreover, if you're playing competitively, you can't play a combination of them either (as in, 2 copies of Cynthia and 2 copies of Professor Oak's Research). Pokémon and many trainer cards with " D " regulation mark and also many cards before the regulation mark was introduced rotated out of Standard format, so to play those cards you have to build an Expanded deck and play it in the Expanded format.
The Pokémon Trading Card Game rules adjust the legality of Pokémon card series and expansions with each season, but owners of old cards have options. The Pokémon Trading Card Game has many old and valuable cards, but only recent collections (like Pokémon Sword & Shield) are allowed in official tournament play. Yes, you can absolutely use old Pokémon cards! The Pokémon Trading Card Game (TCG) has an "Unlimited" format specifically designed for this.
This means there are no restrictions on which cards you can use, regardless of their age or set. Unlimited formats are typically found outside of official championship. So, can you use old Pokemon cards in tournaments? It depends on the format being played.
Most tournaments will be held using the Standard Format (also referred to as modified) which only allows recent sets. If you play in the unlimited format, all cards can be used that were allowed previously. Which Pokémon cards are still playable? The upcoming rotation will effectively phase out all "D" regulation cards, which includes most cards from the Sword & Shield base set and spans all the way back to the Shining Fates expansion.
Any cards that are "E" regulation or newer, or have been reprinted in these sets, will remain legal for tournament play. A reprinted card is a card that has been printed in a previous TCG set and has been included in a newer set. Often times, basic Trainer cards are reprinted, particularly when a new era of the TCG begins.
When a card is reprinted, older versions of a card can still be used in standard tournaments provided the text of the card has not changed. If you have a Pokemon card whose text and abilities are drastically different from another print of the card, then you are simply using a different Pokemon card. That is not a reprint.
Reprints are cards that have the same name AND the same attacks/abilities/effects, etc. For example, Fisherman BKT is a reprint of Fisherman from Skyridge. The wording is off slightly, but they do the same thing.
Yeah, definitely! In casual play with friends, you can use any Pokemon cards you want, old or new. But if we're talking official tournaments, there's a Standard format that only allows the newest sets. There's also an Expanded format where a lot more of the older sets are playable.
So, check the format you're playing!