No. They have the same catch rate as all the other legendary Pokemon. However, they are all in caves, so you can use a dusk ball which has twice the catch rate as an ultra ball (only in caves or at night) and is 200 poke-currency cheaper than an ultra ball.
You could still get lucky with an ultra ball, but if I was using ultra balls, I would bring at least 40 of them, a Pokemon with hypnosis (or some equivalent), maybe false swipe, and save before you try! You could probably be fine with just 30 dusk balls.
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Yes.
honestly its a master ball butt if u can get it right an ultra ball will go far
it doesnt matter what ball you use... ultra ball or master ball is recommended though
Well, if you don't have a masterball, use one... but you can catch one with an ultraball. My friend did. I ran out of them!
Use ultraballs and carry strong Pokemon (ghosts) who know hipnosis and have at least 50 to 60 ultraballs-_-bla bla bla yeah so that is one of the best ways to catch the regis i thought the regis would be easy to catch and transfer to my platinum to get regigigas lv1 but there super hard so if you used your masterball on rayquaza yes it will be hard anyway!!!!!!!!!!!!!even if you get one of the regis on red health and put them tosleep or parylize etc they still pop out of the ultra balls so easy so this might take a while but you could catch the regirock with a ultra ball and don't use your master ball on rayquaza and use it on regice and then migrate regice and regirock to diamond/pearl or platinum and then start your game again and don't use you masterball!!!!!!!!! and when you complete the league open the tombs and catch registeel with the masterball and then if you want you can get another regirock with ulteraballs and then transfer registeel to diamond/pearl or platinum congrats you have the three regis now you shouls get the got of the regis make sure u have the three regis and fly or walk to snowpoint city and if u have completed the Pokemon league you can go into snowpoint temple and keep going through the stairs until u get to regigigas and u go up to it oh by the way it is a bit hard on the ice to get to regigigas and when u do congrats u found regigigas it will be on level 1I would recommend NOT using your masterball because if your using emerald, Sapphire,or ruby Your gonna need it for latios or latias.