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A couple of trainer cards have Pokemon Powers.
Also, there are a couple of cards with really odd one-off mechanics that might screw up an engine that's not prepared for them. Like Dialga+Palkia LEGEND increases the number of prize cards your opponent has, so you can stick them with something like 16 of the things. And some Pokemon like Necrozma Vmax can allow more than 5 Pokemon on the bench.
