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Deals damage. The power of this move is based on the amount of PP remaining after normal PP reduction and the ability Pressure resolve. If Trump Card's PP after use is:
If Trump Card is selected by another move (for instance, Sleep Talk), it uses the remaining PP of the move that chooses it, rather than the remaining PP of Trump Card, to determine the power. Trump Card ignores all accuracy and evasion modifiers.
Trump Card has no competitive use. The conditions that must be met to use this move, let alone at a reasonable Base Power, make it far too unwieldy.