How do you beat duna from fossil fighters

You can use any vivosaur you want but include spinax or styraco at rank 8.
Her team is 2 robo dinosaurs and herself. enrage vivosaurs are best to use.
(i recomand coatlus at rank 6) but I used styraco at rank 9, Guan at rank 7 and Kentro at rank 8. If you're still at the vmm, A krona at rank 8 makes things real
easy but watch out for it's low defence.