Well the more common and better moveset is soft boiled, cosmic power, charge beam and stored power which does absolutely nothing to krookodile. Running moonblast over charge beam means that special walls like chansey, blissey and special tanks like heatran can take hits from you for days (see calcs below). I was just merely mentioning it anyway, over than being a stall breaker krookodile doesn't do much for stall teams though I suppose with proper investment and intimidate it could be nice against hard hitting physical pokemon.
4 SpA Clefable Stored Power (260 BP) vs. 252 HP / 252+ SpD Heatran: 62-73 (16 - 18.9%) -- possible 8HKO after Leftovers recovery
vs charge beam boosted variants
+6 4 SpA Clefable Stored Power (380 BP) vs. 252 HP / 252+ SpD Heatran: 360-424 (93.2 - 109.8%) -- 62.5% chance to OHKO
and
4 SpA Clefable Stored Power (260 BP) vs. 252 HP / 4 SpD Eviolite Chansey: 114-135 (16.1 - 19.1%) -- possible 6HKO
vs
+6 4 SpA Clefable Stored Power (380 BP) vs. 252 HP / 4 SpD Eviolite Chansey: 667-785 (94.7 - 111.5%) -- 68.8% chance to OHKO
I see, I guess that makes sense. I don't really get why people run Cosmic Power over Calm Mind (or why people really even use Clefable, it's not THAT great), but Krookodile would hard counter that indeed.