Raising Pet Level
Pets can level up in two ways:
Use fruits and fish as food. Each type of fruit and fish provides a different amount of EXP.
Using other pets as level up material
Capture pets in battles and use them as material to provide EXP for your main pet. The EXP provided by a pet-material varies depending on its species, rarity and level.
When the pet reaches level 100 it will receive 1 (one) level more in one of its skills.