Wizards Black Star Promos is a set in the Base series. It was released on July 1, 1999. The printed size is 53, and the checklist is the same length. Venusaur is 13/53, in position 13 of 53 on this checklist. Before it is 12 Mewtwo, and after it is 14 Mewtwo. The listed rarity is Promo.
Venusaur is a Stage 2 Grass Pokémon with 100 HP. The card lists level 16. In the Pokédex this is Venusaur (#003), generation 1 (Kanto). The card says it evolves from Ivysaur. In this catalog that name is Ivysaur (#002).
Ken Sugimori illustrated this card. The same name is on 1,112 other cards in the catalog.
Venusaur (#003) has 46 other cards in the catalog. Those other cards are in 27 sets. The other printings with a release date run from 1999 to 2025. The earliest other card is Venusaur 15/102 in Base (1999). Both list 100 HP. The rarity there is Rare Holo, and here it is Promo. Mitsuhiro Arita illustrated that card, and Ken Sugimori illustrated this one. 40 other cards of Venusaur list a different HP.
Solar Power is listed as Pokémon Power. Once during your turn (before your attack), you may use this power. Your Active Pokémon and the Defending Pokémon are no longer Asleep, Confused, Paralyzed, or Poisoned. This power can't be used if Venusaur is Asleep, Confused, or Paralyzed. The attack Mega Drain lists 40 damage. The cost is Grass, Grass, Grass, Grass. Remove a number of damage counters from Venusaur equal to half the damage done to the Defending Pokémon (after applying Weakness and Resistance) (rounded up to the nearest 10). If Venusaur has fewer damage counters than that, remove all of them. Weakness is Fire ×2. Retreat cost is 2. The flavor text reads "This plant blooms when it is absorbing solar energy. It stays on the move to seek sunlight."
I keep a set binder for Wizards Black Star Promos, meant to hold every card of that set. This card is one slot in the Wizards Black Star Promos set binder. A generation binder holds one card of each species. Venusaur can fill a slot in Generation 1 binder (Kanto). I still need this card.