Yes, you don't need a masterball to catch him. I've caught him countless times with an Ultra Ball. Just make sure you have over 100 Ultra Balls before challenging him, he is very, very, very hard to catch with Ultra Balls, but it is completely possible.
Yeah it is possible to catch kyogre with out wasting your masterball you wont have to use it until you see latias and latias requires you to use your masterball.
weaken it and put it to sleep
you can, the catch is fairly easy even without a masterball although I woul use ultra balls if you arent going to use a masterball. I you knock out reshiram without sAVing before hand you can try again after the credits at dragonspiral tower
A fleeing legendary pokemon
try using dusk balls
No.
Use something like mean look to keep it from running, then catch it like you normally catch a legendary.
Use a quick ball and hope- but if it doesn't work it will flee
the masterball is for any Pokemon you want, it can catch them without fail ( it will ALLWAYS work ) . you are supposed to use it for mewtwo though. :P
no
Use a masterball,parilize it,constently huck balls at it,damage it.
the strongest pokeball is the masterball. the masterball can catch any Pokemon out of the 493. it doesnt matter what kind of Pokemon it is, the masterball can catch any Pokemon.