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Unfair stamp issue

Just saw a game on stream, where someone was able to use unfair stamp by knocking out their own Pokemon. This shouldn't of happened as the card states it needs to be knocked out by your opponent's Pokemon.
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In what I witnessed the opponent knocked their own Pokemon out, in this case a Ralts by using Gardevoir ex's ability. They were then able to activate Unfair Stamp, when they shouldn't have been able too.
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Sorry I misread what you wrote, and it wont let me edit my second one for some reason.
In what I witnessed the opponent knocked their own Pokemon out, in this case a Ralts by using Gardevoir ex's ability. They were then able to activate Unfair Stamp, when they shouldn't have been able too.
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They used Gardevoir EX ability to knock out a Ralts.
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"Knocked Out during your opponent's last turn." is it being specified. It has to be your opponent knocking your Pokemon out, you can not knock it out yourself and use the card.
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