In the new Pokemon X and Y game it is the shiny Pokemon that everyone is talking about and it Geek.com said that the rate of these has now been adjusted and this will make it easier to catch one. There is a guide to help you catch one and it may be as simple as just pressing one button.
One of the ways you are able to get hold of a shiny Pokemon is by giving a top of $100, $500 or $1000 to an NPC. Geek pointed out that they did this and then they found a shiny Pokemon. Since then they have not come across one.
You could also try the Matsuda method and this is names after the Game Freak producer. This means that you can breed Pokemon that you find in different locations and this will ensure that the egg stands more chance of being a shiny one. Bear in mind that if you choose this method you will have to walk a lot for the egg to hatch.
There is another way and this is the Poke Radar chain, which makes a comeback in Pokemon X and Y. You can get this on the 2nd floor of Professor Sycamore after beating the Elite Four. With the device you can chain Pokemon and if you do this right you can come across shiny Pokemon in the grass. You should activate your Pokemon radar and then work your way across to meet identical Pokemon and this will create a chain. It also boosts up the chances of you coming across a shiny Pokemon. You do have to watch the grass and how it moves and then go a patch of grass that moves in the same way. At the same time you need to ward off wild Pokemon because if you run into one it will break the chain. While this sounds tedious it is one of the best ways of getting your hands on a shiny Pokemon in Pokemon X and Y.