Yes Sableye has Keen Eye as well as Stall as it's Normal Ability and Prankster as it's Hidden Ability.
In Pokémon X and Y you can get a Sableye with Keen Eye in Reflection Cave. Note not all Sableye you catch will have Keen Eye as it's Ability.
In Pokémon X and Y you can get a Sableye with Prankster in the Dark type Friend Safari. Note not all Sableye you catch in the Dark type Friend Safari will have Prankster.
Other alternative methods to getting a Sableye with your desired Ability involve trading, breeding or migrating one over using Pokémon Bank.
Hope I helped :)