There are various other things and features to explore but there is nothing really you can do after you beat the game.
you get Dinomation by getting 100 Vivosaurs up to rank 12 and that's how you get Dinomation!
You need to battle a guy and when you kill him you get the fossil.
It should be in Coldfeet Glaciar
Knotwood Forest
rj toillia mayfish
How do you become a level five foissil fighter on the Ds
The mysterious girl is Duna
Im not sure but I will keep an eye out for it.
bootsup bay
you can't
You press start to save in fossil fighters. It even says how to save in your Instruction booklet
Go to the shop it cost 10,000 snowberries