You can find him at bonemoth
Yes! You can send fossils from fossil fighters to fossil fighters champions via the fossil cannon, located in Ribular town in Fossil Fighters Champions.
No but you can send fossils from fossil fighters to fossil fighters champions.
no
No but you can use the fossil cannon to shoot FOSSILS (NOT vivosaurs) to champions from the original, not vice-versa.
somewhere in rainbow canyon
Spinax is donation point vivosaur, meaning its fossils can be bought with donation points.
ANy random dig site just be lucky
You can only get fossil fighters champions vivosaurs in fossil fighters champions! Is that simple enough for ya?
you get one as a prize at the cup. There's also a chance to find these when digging. You can also buy these and gold fossils with donation points.
It is in China!
People say it's in hot springs or parchment desert I checked both no luck ):
For the original Fossil Fighters game, you can get Elasmoth in Bottomsup Bay. No idea about Fossil Fighters Champions, though...