From what I understnad petpet levels do NOT matter in the battledom anymore. They used to incrase yout attack based on the level. Al though inm not certain, a level 1 petpet would incrase your total dmg by 1.1%, a level 2 by 1.2%, ect... Of course, the odds of a petpet "appearing" were the same even if you kept refreshing the page. Hence you could refersh a battle page until your petpet appeared. Thus they removed petpets from 1 player and only gave them to the persn who "clicked go first" in two player. Then some other bug allowed petpets to be insanly high(like lv 150), meaning they do 16 times the normal dmg). and thus they removed petpets all togeather. A good idea gone wrong becausethey were too lazy to program it well