There's sheildon but its from pearl.U can get other fossils like the ones in
emerald,ruby,sapphire,firered,and leafgreen but u need to beat the elite 4 and get the
national pokedex.

there are other fossils like aerodactyl(flying),omanyte(snail),kabuto (shield),anorith
(scorpin),cranidos (armored dinosaur) and thats just diamond my brother has pearl. the
hardest one to find to me is aerodactyl, it's like a purple flying dragon its flying,
fire, and dragon I think just keep looking. I have maby 20 of each.

go underground and dig for stuff in the walls

after u defeat the elite 4 get the national dex u can find dome fossil claw fossil skull
fossil armour fossil helix fossil and root fossil and in not fossils(easy 4 me 2 get)old
amber

wer do u get the fossil made into pokemon
i havent even god cranidos

and go north from the mine. there should be the coal museum. you need at least one blank
space in your party. talk to the man at the desk, then select a fossil. then leave. go
right back in and talk to him. he will asay you are late. that's okay, you still get it
back.