You get to remove an Energy attached to your opponents Active Pokemon, and you get to accelerate an Energy to your Active Pokemon too
It does, however, look so much prettier on the Bench as it boosts your Basic Pokemons attacks

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For the purpose of this article, Im focusing on white cards that trigger when they enter rather than those that only trigger when another permanent enters, just to keep things concise
No player may respond between the time you sacrifice it and the time you proliferate