I wouldn't consider it a bad thing, just not the best descision. Because there are still many legendary Pokemon that are much harder to catch then Palkia/Dialga. I would have recommended bringing ultra balls instead.
master ball palkia can be caught with net ball
you can catch palkia by going to spear pilla and solve the maze in it and when you finish that catch it with a master ball (i caught it with a dusk ball) and you will have a palkia!
Use it on Palkia.
Yes, a master ball always works on any pokemon any time.
no u loose it :0
No.
Every Pokemon can be caught without a master ball. And just because you verse a legendary doesn't mean it has to be caught with a master ball. Because I caught a Ho-oh in a Poke Ball.(In Soulsilver). I ACTUALLY DID SO I DID!!!!!!!!!!!! and when i was in Pokemon platinum i caught dialga and palkia with an ultra ball on my second try.HE ACTUALLY DID SO HE DID!!!!!!!!!!!!!Thank you for spending your time on this question. :)Also, I'd recommend saving your masterball for Cresselia, as she always flees from battle.
I can't remember where to get the quick ball but that's what i caught mine in and it worked pretty well.
Ultra Ball
You get the first master ball from Cyrus, the Team Galactic leader. The only other way to get another master ball is to get a complete match in the lottery in the Jubilife City TV building, and the attendent will give you a master ball. If you want to catch Palkia and Dialga, I recomend you weaken them and use an ultra ball. I caught Palkia with it.
No. Any Pokemon in the world can be caught with an ordinary ball. For example, my friend caught a Palkia with a regular pokeball. For some advice, buy an AR (Action Replay). I beat all my friends instantly with an AR(DSI).
you can use master ball in caught the groudon