Articuno

While Articuno has a lot of counters, it is truly underrated. It can Roar away the feared Calm Mind Celebi, laughs at most Swampert, and can easily stall out Blissey and all sorts of Water-types. As Grass-types don't appreciate the threat of a STAB Ice Beam, Articuno does a great job at absorbing Sleep Powder and Spore, and even Milotic's Hypnosis. Additionally, Articuno nullifies Snorlax with Reflect and either Haze or Roar. It also scares away any Salamence without Rock Slide and keeps it from coming in regardless of the set. Finally, Articuno is not 2HKOed by most non-STAB Thunderbolts. It takes some prediction to do good damage with Articuno, though.