Pokepark ground textures?

Hi all,

I have been wondering where the ground textures are stored in pokepark 2.
I am quite new in this ripping world so I don't understand everything quite well

Anyhow, after looking at the source I've seen mutiple file typse, like:
Dac,
and EFB.

I know bress file contains the models but thats all..
So could anybody tell me more about these file formats and how to get the ground textures or some sort?

Thanks in advance