Mew EX + Mewtwo EX

While honestly a bit more of a Mewtwo EX deck than a Mew EX deck, Mew EX gives a bit of a unique flavor. It can come in early-game and wall for its team and then drop from play with Budding Expeditioner to make way for Mewtwo EX to sweep, and/or it can sit on the bench and amass energy, ready to come in and potentially counter any big-name cards that may otherwise be threatening a sweep. The best part is the fact that having even one Gardevoir on the bench makes the heavy energy investment needed far more manageable.