How do you get a shiny Eevee in Pokemon X and Y?

Shiny Pokemon have a 1/8192 chance of occurrence.

so you might as well buy yourself an action reply and get the shiny code.

On rt 212 go into the trophy garden and talk to two men in the masters ofice and one will say about a rare Pokemon running up to him in the garden so go there and you will find one of that rare Pokemon there will be a different Pokemon every day. If you cant wait just save your game and change your time to 1 minuet to midnight and wait a minuet and it will be a different Pokemon.