>>50683492My second idea is just this, but looking like a pokemon.
You get the twisted rib fossil, and during the reviving process you have to turn your switch upside down and you get one of these. The Normal/Dragon is just a big derpy looking reptile but the Ghost/Dragon is an actual dinosaur.... but still not right looking. Got the big sunken in skeletal look. I can see me changing it to be Dark type to make it more vicious and cruel in temperament.
Actual rock-type fossils are a tullimonstrum and a hadrosaur. I haven't drawn any of these but I see the Tully's Monster looking like if a Xenomorph fucked a fish. I'll see what gen 9 does with it's fossils before I commit to an idea.