As we all know we all love to have shiny Pokemon with their new colours. But doesn't it get annoying when you can't get one? Well Nintendo said (On the GTS site) Traded Pokemon when breeding can make a higher chance of getting a shiny Pokemon! But it won't be 100% defiantly shiny but there's a better chance of getting a shiny Pokemon.
Just to say there is no way for a shiny legendary Pokemon to appear the only reason Nintendo put in so that if you use AR your game will not crash or brake. Every other Pokemon can be shiny though!