ultra rare first pokemon card Rocket's Mewtwo Holo 1st Edition - Gym Challenge Pokémon 14/132 Super Rare Vintage Pokémon Card

1998 Metal Universe Diamond Heroes #1 PSA 8: +127% Growth 2026 Sale: $125 (3/22/2026) Previous Sales: $55 (12/28/2025) Card Appeal: This is one of the most visually striking inserts from one of the most iconic baseball card sets of the decade

However, Charizard also has another worthy contender for the throne to compete with, and it's not a surprise that its opposing Pokemon slides into second place with one of the most valuable cards ever

These tournament promos can be worth hundreds of dollars, or more

Production numbers were massive and for years many assumed that cards from the decade would never command serious money