Most comprehensive capture guide for legendaries in OR and AS I have found

http://www.gameskinny.com/6sxgf/pokemon-omega-ruby-and-alpha-sapphire-legendary-capture-guide

All credit given to gamer Autumn Fish, who contributes to gameskinny.com.

Thanks a lot Autumn, it really helped me a great deal, making it simpler to know what to do exactly.
I hope you don't mind me linking to your article...