Levels are the stats of your pets.. They determine how good or bad a pet is. You can view them when looking at a pet.
Due to this new leveling system, pet levels are entirely random and can not be influenced in any way when hatching an egg.
Gold, Rainbow, and Dark Matter
When turning your pets into its gold, rainbow, or dark matter form, their stats will be much higher than their normal form. If you want to know the average stats for a gold, rainbow, or dark matter form of a pet, click here.