Du WILL NEED:
_a very fast Pokemon level 40 oder Mehr that knows spinne Web(like Ariados),Mean Look(as Golbat and Crobat),or Block.Is better that Du give Rapid Claw at this Pokémon;
_A Pokemon level 40 oder Mehr that knows a paralyzing Bewegen (like Thunder Wave oder Stun Spore);
_A Pokemon level 40+ that knows False Swipe (like Sneasel,Weavile,Scyther and Scizor);
_Max Repellents,Ultraballs,Timerballs,Darkballs,and,ifyou want,Weightballs.
AN ADVICE:do this part in the evening,you will have Mehr catch rating and luck with the Darkballs!!
1)Go to a city,I suggest New Bark Town,because has only one near Route and is Mehr simple in this way to run into the fugitive Legendaries;
2)Continue to go to and fro the city and the near Routes,until that the Legendaries arrive in your same Route;
2)Spray the Max Repellent,and go in the gras, grass with the Pokemon with trapping Bewegen at first place in your party.Pokémon MUST to have 105+ in Speed;
3)Use IMMEDIATELY the trapping Move.Therefore,replace it with the Pokemon with Paralyzing Move;
4)Use IMMEDIATELY the paralyzing Move.So,replace it with the Pokemon with False Swipe;
5)Continue to Use False Swipe.When the Legendaries will had only 1 HP,throw it all the Ball string Du have!
6)Hope with all your herz that the capture succeeds!
I hope to have helped you!Write here if these are good advises!