Use a masterball,parilize it,constently huck balls at it,damage it.
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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.
you need to first atack it with say a level 40 Pokemon and then atack it just inuff to get it on red and then use grasswhistle\sing or sleep powder and use a timer ball.OK thank you
For catching a zapdos.First you will need at least 20 ultraballs.Second you will need a pokemon that can sleep the rival pokemons. Now to catch zapdos first weak it and then sleep it and start throwing ultraballs at it. You will catch it after 10,11 or 12th trial
Use a Master Ball. Put it to sleep and then make its health really low, then throw Ultra Balls at it. If it wakes up, Paralyze it. It often helps if the Pokemon you are trying to catch has a status condition (Sleep, Poison, etc.). Using the move False Swipe (which Scyther learns) lowers the foe Pokemon's health to 1 HP and no less. Ultra Balls have a higher catch rate, so use a lot of them. If you can, factor in some Time Balls.
put them to sleep, or paralyze them