Cloyster is not so popular pokemon and i 'd like to suggest bit buffing him, not much but in my opinion he has very low dmg from blizzard, i mean veery low, 100 lv deals 1,5k per hit, since it's his main ice move and only aoe(not counting aurora beam as aoe) it should be buffed as i said "a bit" like 1,7-8 should be nice, and i would change aqua jest for water gun