If you've been told that you can go to greenhorn plains then go to the fighter area, talk to Beth and she'll ask what dig site you want to travel to, then give you the options and you have to click on greenhorn plains.
no you cant but u cant but you can find all the vivosaurs that are from the old one. The only way to get spinax though is through donation points which i believe is 180 or something
Yes! You can send fossils from fossil fighters to fossil fighters champions via the fossil cannon, located in Ribular town in Fossil Fighters Champions.
in rivit ravine. right before the entrance to the mines, you might see a rock blocking a bridge to the east. if the rock isn't there, cross the bridge and search the area