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 Which one is considered shadowless?

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 Which one is considered shadowless?
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SKU: 4904000259

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Description

Gingerbread Cabin: #3

8 Lake of the Dead With limited reprints, Lake of the Dead has become quite a pricey card over time

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