You should press A and then B in rapid secession
you dont......you have to cheat but i am still trying to figure out how.
you can't without cheating
There isn't a way to get master balls with cheating...
use ultra balls
I do belive there won't be that kind of cheat, but a smart, but long way is to buy a Pokemon pearl, or diamond, then cheating on that game, then trading and having those Pokemon have master balls.
Use alot of Ultra balls and status moves
go to oak and press L
Getting master balls without cheating in Pokemon DP is very hard. The only ways are: to win the lottery in Jubilife City, or receive a Pokemon that has a master ball from trading. I have 2 master balls in my game. I traded with a person who had a Pokemon with a master ball.
you have to get master balls from professor roan
cheating
There are none.
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.