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every mon that is not in the galar dex could be now considered extinct.
There wont be new fossil pokemon because they are just lazy fucks. Alola didnt have them too -ok, Alola beeing a volcanic island probably doesnt have a very old geologic history or fossil record at all, but there was this fossil nerd with that jurassic park reference on that one island, but they just reused already existing fossilmons this gen, despite england beeing the motherland of paleontology.
if i would have the chance to make two galar fossil lines, it would be probably a crystal palace iguanodon that turns inot a accurate iguanodon and a baryonyx that turns into a spino. Nessie can be a legendary/mystical, but ive given up hope on this gen.