>>41899750if I'm not mistaken, that's because since these are getting revived from fossils, aka rock, there's not enough original biological material (really there wouldn't be any at all, but I digress), and the missing parts are filled in by the rock of the fossil itself, hence, half rock-type.
I'd imagine, with enough solid fossils, you might get the foll non-rock fossilmon, but if these are extremely rare a la
>>41898862, it may not be feasible or worth it to do so.
