how many energy cards in a pokemon deck questionπβΌοΈ : r/PokemonTCG Holo Energy Card Age Group Limits - What You Can
Description
Not only is it from the first edition of the Base Set, but it is also holographic and shadowless, indicating that it is from one of the first two print runs

Archived from the original on 26 October 2017

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Its Energy Absorption attack was pivotal for countering cards like Energy Removal and setting up Psyburn for future turns
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It also has no minimum requirement of how many cards need to be discarded to activate, so players can use Professor Oak when they don't have much to throw away and still gain seven new cards