I was on playTCG and my opponent played 2 catcher while I didn't have any pokemon on the bench. I was wondering if this was legal since I heard that you cannot play a card unless you can use it's effect, but I'm not sure. Thanks in advance.
You can't rely on things that happen on playtcg. You can only play a card if you can do the effect. It's really clear when the effect involves public knowledge. You just always have to do as much of the card effect as you can. But if the effect can obviously fail you may not play the card.