No, I not don't know of a chart or anything similar that gives a full list of Shiny 6th Gen Pokemon. However, there is an alternative, which is actually, in my opinion, better than a chart anyway.
Pokemon Showdown!, a competitive Pokemon battling simulator, uses the Generation 6 sprites for their battle simulator. They have front and back sprites for every Pokemon, including the Shiny versions. I believe they got them from PKParaiso, a Spanish Pokemon site that took the sprites from X and Y, so credit to them also.
The easiest way to do this is to take this link and replace the word "Pokemon" with the name of the Pokemon you want to see Shiny. This will give you a fully-animated Shiny image of that Pokemon. http://play.pokemonshowdown.com/sprites/xyani-shiny/pokemon.gif
For example, here's a Shiny Salamence:
