Saw some of those back in Gen4 and Gen5, Timid / Modest Suicune with Life Orb or Expert Belt or even Chesto Rest in some occasions, usually runs Hydro Pump or Surf as STAB, mandatory Calm Mind and Ice Beam, then depending on generation's threat list and needed coverage Hidden Power Electric or Grass help it a lot, Air Slash sadly has to be paired with a Relaxed nature, maybe in this geberation in addition to the ither Hidden Power type, Fire type one can find some place, other neutral coverage moves worthy of consideration are Shadow Ball for things like bulky water that have Psychic and Ghost as secondary type (to be hit harder than HP) and Extrasensory for general Suicune checks like Toxicroak, Tentacruel or Guts/Mega Heracross.
Hope I did help you.
