Attack3-D Attack
Flip 3 coins. This attack does 10 damage times the number of heads.

Unseen Forces is a set in the EX series. It was released on August 1, 2005. The printed size is 115. This checklist is longer, at 145 cards. Porygon is 69/115, in position 71 of 145 on this checklist. Before it is 68 Poliwhirl, and after it is 70 Pupitar. The listed rarity is Common.
Porygon is a Basic Colorless Pokémon with 50 HP. In the Pokédex this is Porygon (#137), generation 1 (Kanto). The card lists Porygon2, Porygon2 (#233) under evolves to.
Kagemaru Himeno illustrated this card. The same name is on 656 other cards in the catalog.
Porygon (#137) has 23 other cards in the catalog. Those other cards are in 22 sets. The other printings with a release date run from 1999 to 2025. The earliest other card is Porygon 39/102 in Base (1999). That card lists 30 HP, and this one lists 50 HP. The rarity there is Uncommon, and here it is Common. Tomoaki Imakuni illustrated that card, and Kagemaru Himeno illustrated this one. 15 other cards of Porygon list a different HP.
The attack 3-D Attack lists 10× damage. The cost is Colorless. Flip 3 coins. This attack does 10 damage times the number of heads. Weakness is Fighting ×2. Retreat cost is 1.
I keep a set binder for Unseen Forces, meant to hold every card of that set. This card is one slot in the Unseen Forces set binder. A generation binder holds one card of each species. Porygon can fill a slot in Generation 1 binder (Kanto). I still need this card.
Flip 3 coins. This attack does 10 damage times the number of heads.
Unseen Forces, in the EX series. It was released on August 1, 2005. The printed size is 115.
69/115. It is entry 71 of 145 in this checklist.
Kagemaru Himeno. The catalog lists 656 other cards with that illustrator.
Common.
Porygon #137, generation 1 (Kanto).
3-D Attack (10×).