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.
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probably ultra or time or speed depending on how quick you try to catch it
Yes. It is completely possible to catch Mewtwo with an ultra ball.
For Zapdos: Go through the power plant and use your master ball, If Master ball has been used then attempt to capture with Great ball or Ultra ball. For Moltres: Go to Mt. Ember and climb to the summit and Moltres will be waiting. Use your Master ball, If used try to capture with Great ball or Ultra ball. For Articuno: Go to the Sea foam caves and move the boulders through the empty holes ( Strenght HM Is needed ) Articuno is tricky to catch. Use your Master ball, If used try to capture with Great ball or Ultra ball.
Yes, the Ultra Ball has a 4x catch rate than a Premier Ball, which has the same catch rate as a normal Poke Ball. It is commonly used to catch rare or Legendary Pokemon.
Yes.