Well, if you don't have a masterball, use one... but you can catch one with an ultraball. My friend did. I ran out of them!
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Which PokeBall?If you don't have a Master Ball anymore, then use Dusk Balls more than Ultra Balls at night; Dusk Balls have better chances of catching than Ultra Balls at night. If you can't wait until dusk when it's daytime, then you'd use Ultra Balls.
If you are good at catching legendaries, then you would need at least 10 but 15 would be safe. If you are not good at catching legendaries, then I would get 25 ultra balls.
honestly its a master ball butt if u can get it right an ultra ball will go far
it doesnt matter what ball you use... ultra ball or master ball is recommended though
Before you battle, make sure you safe because if you kill the articuno it won't come back. attack the Articuno until it has low HP. Then use a move that puts it to sleep or parlyzes it. This will increase your chances of catching it.