Where can I find the Type Gems in XY?

Question

I can't find the Flying Gem anywhere but I've got a Normal Gem in my inventory so I guess they are in the game! Does anyone know?

Answer 1

The only Type Gem legally obtainable past Generation V is the Normal Gem. In X & Y, it's infinitely renewable by checking in Terminus Cave from time to time. Several event Diancie also came holding a Normal Gem. (Source)

The other seventeen Gems exist in the game's code, but they're unable to be found without hacking them in. You're unable to transfer items through PokeBank, so it's impossible to transfer the Gems up from Generation V. You're out of luck if you want anything other than a Normal Gem in X & Y. (Source)

Answer 2

I think you can find them if you press A on rocks you can't destroy, or use the Dowsing machine, or you can use Rock Smash. I think the Dowsing machine is the best option!

Hope that helped and good luck finding the gems!