you need to first atack it with say a level 40 Pokemon and then atack it just inuff to get it on red and then use grasswhistle\sing or sleep powder and use a timer ball.OK thank you
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weaken it's health to red and paralyze it. use tons of pokeballs or other kinds.
no
probably ultra or time or speed depending on how quick you try to catch it
Of course, a Master Ball catches any Pokemon without fail, Legendary or not.
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.