pokemon japanese card Limited Sale Pre-order {M6 Box} Storm Emeralda 30 booster packs per booster box 5 cards per booster pack The ranks of Ancient and Future Pokémon continue to grow Non-Sports Cards - 2000 Nintendo

They might not be a meaningfully supported archetype in most sets, but you still find them, often as a boon for doing something simple like triggering heroic on Phalanx Leader, to juicing up a card like Ancient Animus, or just to make an aggressive deck more viable

Scarlet & Violet Era (2023-2024) Shiny Treasure ex featured shiny variants of SV-era Pokemon

But I've only found of these "1999-2000" energy cards (1 Fire, 2 Lightning, 2 Water)

Sylveon VMAX 75/203 - Evolving Skies Holofoil Sylveon VMAX 75/203 - Evolving Skies Holofoil The Pokmon Company Attach an Energy card from your hand to 1 of your Benched Pokmon