Giang Hoβs been whispering amongs others that if you want high percentage of PVP winning rate, you can't ignore true "Fire God" type of PETs. Why? Simply because they possess the ability to continuously & agressively attack to finish off the opponent in a blink of an eye.
However, to be able to use fire-type PET to optimize damage, you should never ignore the supporting card: Rage Attack
See more at: https://docs.moniwar.io/gameplay/about-pets/pet-elements/pyros-fire?
Btw, if you are passionate about fire-type PETs, don't hesitate to visit the Marketplace to buy one at the cheapest price in the market.