From Bulbapedia, the community-driven Pokémon encyclopedia.
Boltevoir deck is the name of the deck used by Michael Pramawat, the Masters Division Finalist in the 2010 World Championships. It predominantly features and Pokémon and works by setting up Gardevoir with Spiritomb, and continuously exploit Gardevoir's Psychic Lock attack to prevent the opponent from using key effects on their cards to win the game.
Boltevoir is one of the four 2010 World Championships Decks, released in November 2010. Each deck comes packaged with a 2010 World Championships Booklet. Each card features a silver border, Pramawat's signature, and limited edition 2010 World Championships back. None of the cards are tournament legal.
Like a bolt from the blue, Michael Pramawat's Boltevoir deck will blast your opponent's! With lots of options—including Gardevoir to give you access to your opponent's Supporter cards and shut down Poké-Powers, Gallade to damage your opponent's Pokémon so Gardevoir LV.X can make the Knock Out, and Machamp to take care of your opponent's Pokémon that aren't evolved—its combos just keep coming!
Both the physical Boltevoir deck as well as the list in the accompanying booklet have the wrong Machop in them - according to Pramawat's own Worlds report, he ran Machop (Stormfront 64).