If you can upgrade the pets not obtained in the wild; i will save the "rare upgrade" them. That is what I was thinking. Given that there's room for 650 pets, it would take 650 stones ot upgrade them all. I'm happy for a stone here and there but hunting works well for more populous pets. I...

I don't know when exactly it is determined but it has been determined once the battle starts. You can guess based on the stats or there are addons that will show you clearly. I use an addon called PetTracker and it shows you the rarity of all pets in the team you are battling against, as well as the...