how to tell what set pokemon cards are from

how to tell what set pokemon cards are from I'm new this hobby, please help me understand. Explain it to me like you would a small child lol. I've tried looking it up and I cannot, for the life of how to tell the set

Name: how to tell what set pokemon cards are from I'm new this hobby, please help me understand. Explain it to me like you would a small child lol. I've tried looking it up and I cannot, for the life of how to tell the set
Brand: neuraldrones.de
SKU: 50214435710
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SKU: 50214435710

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Description

This card can be attached to a Pokemon, and once the Pokemon is attacked, 20 damage will be dealt to the attacker

1999 Pokmon Gyarados Unnumbered Promo 64 Mario Stadium Best Photo Contest Value: $87,500 This Gyarados card was printed from a winning Pokmon Snap contest entry, making it part of a very small set of real cards based on in-game photos