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This lets you take everyone out of the game in one swoop, rather than having to take opponents out one at a time and risk losing your board state

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These include, but not limited to: not placing down a Basic Pokmon in an open bench slot, placing energy on a non-active Pokmon when the active Pokmon has no energy, refusing to send in Pokmon with sufficient energy, and activating X-Speed and then not retreating their active Pokmon (or even worse, retreating and then using X Speed)

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Even though it has no effects it can use while it's not equipped to a Monster, you can still use it as a Monster should it be needed (although this should very rarely be necessary)