So far, all Level 2 "Chemicritter" monsters' combined ATK and DEF equal 2100 while the "Poly-" ones (Level 8) equal 3000. One oddity is that along with multiple Attributes and Types, each has a combination that is rare in the game, such as Aqua combined with FIRE and Beast combined with WIND.
"Chemicritter" monsters are named after a chemical substance and an animal, while "Poly-Chemicritter" monster are given names that are a combination of two creatures (eg. Hydra + Dragon). Each member of the archetype has a symbol(s) on their bodies to represent the chemical substance that they are based on, e.g. "Hydron Hawk" having the letter "H" on its chest to represent its hydrogen basis.