On the bottom of the screen, it says use item. Click on the ball you want to use and press use item.
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Lower its HP until it's at the Red marker. Find it again, then put it to sleep with a fast Pokemon. (Suggest darkrai) Get a variety of poke balls and throw them at the Pokemon to try and catch it. If you have used poke balls a lot of turns then throw a TIMER BALL.
You don't need to do anything. Just enter the code. When you throw any kind of Poke Ball, it will be like a Master Ball, even if the Pokemon is at full health.
use a ultra/great ball
A poke ball costs 200 poke's (in game money) A great ball costs 600 poke's An ultra ball costs 1200 poke's But you can't by a master ball but you get one just by playing.
In poke marts