Another note, I think making a pet level 3 rarely worths it. I think if we make it scale logarithmically like 1-2-4 instead of 1-2-3 it would be much better for many pets.
Koala is either too op or too useless. Why not make it so Number of times it works scales with level? Also it should reset at the start of turn maybe so even if it triggers at end turn, it also works on battle.