ok so I heard something called an essense what is it and where can I get one

You can use essences to generate new pets. They come in regular, enhanced, or mystical. Regular and enhanced can be got through tons of ways throughout the site, such as from battling monsters, opening satchels, playing games, nurturing, etc etc. Most things that reward prizes have a chance of rewarding a regular or enhanced essence. All 3 types can also be bought from the diamond shop, and mystical essences are exclusive to the diamond shop.

Also, the difference between the 3 types of essences has to do with how many gene points you can use with them and how strong the color swing is (color swing is where a pets color will shift somewhat from what you actually select it to be, so like a white pet may turn grey or a red pet might turn pink).

Regular: 2 gene points, Fairly accurate colors

Enhanced: 4 gene points, Mostly accurate colors

Mystical: 4 gene points, Extremely accurate colors