u/Kenrram

Hi i would like to help my gf extend her collection. I would like to understand how the series numbers work. I can find like a green chameleon and as I understand it was purchasable in form of a mystery gacha type product. But I also found it separately selling in official clear box. Is there a difference for collectors? And if Im correct the number ID for the green and purple chameleon is different because that ID is not exclusive to the mystery box but its the ID that the Pet gets when its released.
Also i read about the waves but I see different series and G numbers. Please help me understand! If there is a good video explaining or an article that would be helpful as well ! Thanks a lot!