suicune counters:
Counters
Lapras and Vaporeon with their Water Absorb ability nullify Suicune entirely. Electivire can score super effective Electric hits on the physical side, bypassing any Calm Mind boosts, and Torterra can nail you with Wood Hammer if you do not have Ice Beam. Celebi can Leech Seed you and Recover away damage if you do not have boosted Ice Beams to scare it away. Gyarados with Taunt will thoroughly trounce any Suicune that does not have Hidden Power Electric, and Blissey beats you if you lack Rest. Starmie should be avoided as well if you do not have a few Calm Minds built up. Venusaur can put you to Sleep and wail away with Leaf Storm, or Leech Seed you, as can Sceptile (minus the Sleep part), and obviously Raikou, Zapdos, and Jolteon should be avoided at all costs. If Suicune is without Roar or Hidden Power Electric, Tentacruel can Swords Dance on Suicune and Poison J
people have thought this **** out man, i didn't write it, got it offa smogon.com
there's always a counter for something, if not anything reasonable, it's an uber (different class that's not allowed in most tournies)