No. Sorry, it is a one shot deal. If you haven't gotten there yet don't worry. But if you are about to fight him I suggest you save the game before you fight him.
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the great marsh Or the fight area but there kind of rare in fight area
Hmm... re-catch, like a second time, or you let him go the first time? No. Not without cheating. There are some cheat codes that allow you to fight (and hopefully catch) any Pokemon though, so if you cheat, it is possible. I don't think its good to cheat!! I think he means 2 time but i made him faint in one hit ca i still catch Well, first, you shouldn't have used master ball but, that's MY opinion. I caught Dialga with a timer ball. AND I caught azelf and uxie with ultra balls i think. And the goal isn't really to CATCH dialga, just to encounter him. TIP: Save before you encounter a super rare Pokemon.
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you can go after the legendary pokemon, or beat him again.
every weekend he will be at the fight area for a battle