Do you have a shiny pokemon? Or did someithing weird happen when you tried to catch(or caught) a legendary or shiny pokemon? Post it here.
I've never seen or caught a shiny except the Red garados. But when I was trying to get the Rayquaza in Emerald a few months ago, I forgot about my game boy all together(I new where it was, but I stoped playing it).
Then on black Friday I had to babysit my neighbors kids at 4:30 am so I brought my game boy with me(because I started playing it again). When I put in Emerald I thought I was at the contest hall but I wasn't, I was in Raquaza's room. So I decided to fight him for fun. On the second ultraball I managed to catch it.
I beleve the moral of this story is: If you can't catch it, leave it for a few months and play it again while babysitting.