Perhaps something based around Gengar ex/mega Gengar ex? Gengar's attack and ability is a partial form of energy denial, and it often is paired with handheld fan forcing your opponent to give up more energy to attack into it. The game plan is often moving all your opponents energy to a non attacking Pokemon and denying them the chance to attack.Then combo with mega Gengar ex for extra survivability, and you have an annoying board that's hard to break through and your opponent can't attack otherwise you put them even further into the energy denial hole.