how to tell if pokemon card is base set

how to tell if pokemon card is base set do I know what these were printed in? And what set are my cards from? : r/Pokemoncardappraisal 1st Edition Base Set Cards:

Name: how to tell if pokemon card is base set do I know what these were printed in? And what set are my cards from? : r/Pokemoncardappraisal 1st Edition Base Set Cards:
Brand: neuraldrones.de
SKU: 4904000259
Price: 28.51 USD
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SKU: 4904000259

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Description

In April 2021, an autographed PSA 7 Ishihara GX Promo card went for $247,230 (180,200)

The new Mythical Island-themed booster pack is here in less than a week

Vaporeon ex #149 showcases a dreamy underwater theme, with flowing blue tones and aquatic effects that emphasize its Water typing

This is one of the strongest cards in the new set, especially when paired with Serperior, allowing trainers to do up to 200 damage with just two energies