@treyh37
That actually isn't the correct effect text; well, unless the official website's TCG Card Database has a bogus scan.
There it reads
When you play this Pokémon from your hand to evolve 1 of your Pokémon during your turn, you may have your opponent reveal their hand. Then, discard a card from it.
From what I can tell, it appears the "Once per turn..." was either dropped from the Japanese version, or was never there in the first place but added because TPCi rarely leaves it out. I had to correct this over two other websites so far. Maybe
@Water Pokémon Master should consider changing the official translations on PokéBeach to reflect the English text? I'm not sure, because I am a poser who doesn't read any Japanese, so I don't know if they really include "Once per turn..." or not. ^^' It also is a bit like closing the barn doors after the horse has already bolted, and so it may not help much. >_<
So other than that, trehy37 is right,
@Troy94. As many times as you can trigger Queenly Majesty in a turn, it will work. It isn't as effective as it sounds, though; this set gave us
Oranguru, while most decks already try to have options (both in how they are built and run) to deal with topdeck situations. Annoying to almost all decks, but only really threatening under specific circumstances.