How to get articuno, zapdos and moltres
This is actually really easy. You'll need a fairly strong Pokemon (i suggest a blastoise that knows mega punch, that's what I used), a snorlax (best for making things sleep), and a lot of ultra balls. But right before you start battling, SAVE THE GAME.
If something bad happens, turn the game off and start over right before you were going to battle. Ok, send out your fairly strong Pokemon first, and get the enemy to it's lowest health without fainting it. Then send out snorlax. Use yawn.
Once the bird is asleep, throw ultra balls at it. You won't get it the first time, I can almost gurantee that, but that's why you should have a lot of them. I did this when I only had 15 ultra balls, you should have more. See you later... I guess.
Added by: Pokemon...person Mar 28th 2007, ID#10541