Question

Where do you get more Moon stones in Pokemon X?

Answer 1

Since I don't know which ones you have already, I'll list all of their locations.

• Reflection Cave
  >1F; south of Battle Girl Hedvig, on top of the small mesa

• Terminus Cave (this one is on B1F and is hidden so the Dowsing Machine is recommended)
  >Far north side in the gap in the wall

• Secret Super Training (by completing Drag Down Hydreigon! minigame)

• Route 18 (sometimes given if you beat Psychic Inver in an Inverse Battle)

http://bulbapedia.bulbagarden.net/wiki/Evolutionary_stone#List_of_stones

Answer 2

use a level 65-ish pick-up ability Pokemon. they'll find plenty of them, sun stones too. any Pokemon with pick-up can find either stone, or numerous other lovely items randomly. mine has found me 10 sun stones and 8 moon stones... I loves my zigzagoon...