Yes, you can catch Dialga without a Master Ball. Dialga can be caught with any kind of Poké Ball but Dusk Balls and Ultra Balls would be the better options.
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you get a master ball from proffeser rowen to catch Dialga
dialga bring about fifty or more pokeballs weaken it till it's hp is yellow/red but DON'T DEFEAT IT!!!!, p.s you find dialga at spear piller when you defeat Cyrus, trainer's note. you can only catch dialga on diamond. you can only catch palkia on pearl. you can catch dialga palkia/AND GARITINA!, i have platinum and caught all of then so i know post a question about how to get garitina on Pokemon DIAMOND! Actually in Diamond and Pearl u just need the Master Ball that Cyrus Gave you beforehand!
Of course, a Master Ball catches any Pokemon without fail, Legendary or not.
Yes, you can, just like any other catchable Pokemon.Though the catch rate is reduced, it is completely possible to catch Dialga without lower its health. It is recommended to use a Quick Ball on first turn to improve your chances. Of course, the Master Ball can be used to catch Dialga at full health too.
it requires an Action Replay. if you can activate without one, then i don't know how to