Thread:Missingno. Master 2/@comment-12049730-20130715121907/@comment-8168904-20130726021535

I found it in the Glitches page. It's where one of your six Shiny or Shadow Pokemon use Explosion to leave your party while you're battling the legendary bird.

If you enter the round where you fight a legendary bird with Shiny or Shadow Pokemon of their element, you will allow the event that causes you to obtain the Shiny or Shadow legendary bird, correct? Well, if you cause one of your Pokemon to disappear from you party (via Explosion), you won't get the Shiny or Shadow form of the bird, but a regular bird. However, you can do this as many times as you want, which is what I'm doing.