I had already asked a question on that, but only for Victory Road, as I didn't know there were also rocks in other places in Kalos.
So can you tell me how to break the others ?
Berry trees: blizzard, air cutter, or twister
Round rocks: eruption, heat wave, or lava plume
Thin rocks: surf, muddy water, or water spout
Other rocks: rock slide or hyper voice
Snow piles and sand piles: hyper voice or rock slide
Grass: petal blizzard or razor leaf