you can dig any rock out of the ground
yes there is rock under all the ground if you dig you will get to a layer of rock which is very hard to dig through.
gummy worms rock candy pop rocks mounds
they dig burrows in the ground
I would get a rock or ground type and use dig or teach one of your Pokemon dig
Probably onix but all ground type can
Yes, cats can dig holes in the ground.
"magma"
It depending on how hard the ground is. If it is really hard he will only dig small holes in the ground, but I doubt he will dig a barrow.
dig a hole and look for it
Arctic wolves dig their dens. If the ground is frozen, they would find an old den in a rock cleft or cave.
lava
in future tense - Will dig but! in future progressive - will be diging