Any Pokémon is catchable without the Master Ball, though some-especially Legendaries-are harder than others.
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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.
you get a master ball from proffeser rowen to catch Dialga
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.
no
Its always too hard to catch. But you can use a Master Ball right away or a Quick Ball. Occasionally, if its weakened, you can throw a lucky Poke ball at it. That's how I got my Dialga!