ive saw that some people are doing max stat projects, so what are those, and how does it work?

The goal of a Max Stat project is to obtain pets that have all the best statistics they can have (For a Sylesti at level 0, max stats are 100 for strength, intelligence, agility, dexterity), because max stat pets are very good for fighting.

Doing a Max Stat project is quite long and expensive, you need to breed many generations of pets and use philters which will increase the stats of each generation a little bit more.

in addition to what Enyo said:

on level 0, max stat Sylesti also should have 2,000 health and 120 / 100 mana (for fabled and non-fabled respectively). amount of mana is not affected by prisma philters; enhanced and mystical generated pets have maximum of mana from the start (regular generated, however, do not - and this can't be changed, that's why people use more rare and more expensive essences to start such projects; or, if a stat project is based on a themed project, the amount of mana of those pets might be really low)

oh that's cool. I'm guessing it'll need alot of gold/diamonds

Thank you for adding the health (I'm sure I intended to add it but for some reason didn't, or maybe I deleted it when I edited the post).
I forgot about the mana.