I think it is almost impossible. You can use master ball on it. Legendary Pokemon are really powerful and you may need to use even ultra ball (extra legendary Pokemon like mewtwo or lugia are recommended to catch with master ball).
yes
To make any normal Pokeball (not Great or Ultra Ball, just your normal, average, everday Pokeball) a Master Ball, do this: when you throw the ball, hold down A and B, but from the time that the Pokemon goes into the ball to the time that it hits the ground, hold B and Select. Works nearly all the time if you have perfect timing. I caught kyoger and rayquaza with it!
Black rayquaza is the shiny color of a regular green rayquaza to capture it as a black rayquaza it takes 1 out of 8000 chances for it to appear in sky pillar when it does appear you capture it just like the normal rayquaza.
You can't really catch Rayquaza through normal gameplay. However, you can migrate Rayquaza from Pokemon Ruby, Sapphire, or Emerald version to Pokemon Platinum version.In the tower near the place you find Spirtomb passed Hearthome City and below the town with the Daycare.
Which pokeball should you use to catch victini. Well i used the normal pokeball but in my opinion i think that you should use the ultra pokeball
all you have to do is get it low on health and trow a pokeball at it (look for it in the normal types).all you have to do is get it low on health and trow a pokeball at it (look for it in the normal types).
Unfortunately the only real easy way to catch rayquaza is to use your master ball. if you really want to save it for Latias/Latios (Which you shouldn't because rayquaza is 10x better) is to paralyze him and then use the best ball you have in your inventory, but first you must get him down to low red in hp.
use a normal pokeball, use a fire based move that will make it burn, and throw the pokeball at about 3/4 health
buy 10 poke\great\ultra balls and you will be promoted with a premier ball, it has the same effects as a normal pokeball, so its not worth it.
ex deoxys
what do you whant for the dialga
Any Pokeball works. A master ball would be the best though. Just take a look at the special abilities of the pokeballs you have (unless it is a normal pokeball) and then choose which one would be a good one to use. . backward sentence
Snorlax