Cooling is a critical task in maintaining the appropriate temperature for a given facility or environment. Judging from the rankings you provided, Ice Emperor Melopa, Frostmon and Wintercaller are the palu that specialize in cooling.
Answer: Call the Winter Beast
Their respective abilities differ in this field, with Winter Caller performing best, Frostmon second, and Ice Emperor Melpa ranking third.
Ice Emperor Melpa's basic needs and status, although it is slightly less capable in the cooling job, can improve its performance by keeping its morale high and its health superior.
Make sure it gets enough rest and proper care so it can perform better while working.
Secondly, Frost Beasts are valued for their excellent performance in cooling tasks. To fully utilize the Frostbeast's potential, you should focus on improving its relevant skills and abilities.
Improve its effectiveness through combat and training, as well as using specific equipment that enhances its cooldown abilities.