Reuniclus' "Summoning Gate" attack says to look at the top 8 cards of your deck and put any number of Pokemon you find there onto your Bench. Does this allow you to put more than 5 Pokemon on the Bench?

No, Summoning Gate does not allow you to exceed the normal limits of the game. You can put any number of Pokemon you find onto your Bench up to the maximum size of the Bench. In fact, if you use this attack when your Bench is full, the attack does nothing; you can't even look at the top 8 cards of your deck.

Relevant cards

SV5_72