No. The only three elemental stones you can buy in the shop are the Fire, Water and Leaf Stones.
You can also get Charizardite X/Y, Venasaurite and Blastoisite from the man left of the counter. These cost anywhere from 1,000,000 to 10,000 PokeDollars, depending on how stylish you are.
Other evolutionary stones (Sun, Moon, Dusk, Dawn, Shiny) you will have to find around Kalos or get them from Secret Training.