How do you get kings rock in Pokemon X?

Answer 1

There are multiple ways to get a King's Rock: Lysandre Cafe, Held by Wild Poliwhirl, Poliwrath, Hawlucha, and Hariyama. You can also randomly obtain one from the Balloon Popping game on the Pokemon Global Link Website on Level 2. To obtain items from the Pokemon Global Link Website you must create an account and register your Game Sync ID. To obtain the Game Sync ID go on the PSS in-game and tap the folder icon and scroll to the second page and tap the Game Sync button. Allow the game to create an ID then use it to create an account and sync your game on the website.

Answer 2

I think Mewtoo has it ... not sure where else

Answer 3

You can find one in the Slowpoke Well.

You can also buy one at the Pokeathlon Dome on certain days.