[20] On each player's turn, following a set phase order, they draw a card, tap their lands and other permanents as necessary to gain mana to cast spells, engage their creatures in a single attack round against their opponent who may use their own creatures to block the attack, and then complete other actions with any remaining mana

Pokmon TCG: Pokmon GO Pokmon Center Elite Trainer Box Plus (exclusive to Pokmon Center in the US, Canada and the UK) Pokmon TCG: Pokmon GO Elite Trainer Box Pokmon TCG: Pokmon GO Premium CollectionRadiant Eevee Pokmon TCG: Pokmon GO Special Team CollectionTeam Instinct / Team Mystic / Team Valor featuring Spark of Team Instinct, Blanche of Team Mystic and Candela of Team Valor Pokmon TCG: Pokmon GO CollectionAlolan Exeggutor V Pokmon TCG: Pokmon GO Tin featuring Pikachu, Snorlax and Blissey Pokmon TCG: Pokmon GO Pok Ball Tin Pokmon TCG: Pokmon GO Mini Tins featuring Pikachu, Magikarp, Eevee, Snorlax and Blissey, Pokmon TCG: Pokmon GO V Battle Decks featuring Mewtwo V or Melmetal V Pokmon TCG: Pokmon GO V Battle DeckMewtwo vs
Like most Pokmon cards, the value of Eevee depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (SWSH Black Star Promos)
The Watcher in the Water The Watcher in the Water can make a ton of tokens if you can draw a lot of cards at instant speed
But if your question is, What unofficial, licensed cards first had Pokemon on them? then sure, you can look at non-TCG products like Bandai Carddass
Its repeatable and easy on the mana