Regarding the Event Raikou, Entei and Suicune

[Disposable Puppets]

I've run into a few non-shiny Raikou and Entei using their respective moves that were gained from the event. I even went into the team builder and not only can you use a non-shiny beast with these moves, but they can be any nature as well. Is there a way to fix this?

 

[Rising_Dusk]

They cant be any nature. When you try to use them with the wrong nature HAL9000 throws you an error. I cannot force them to be shiny, however, but that's how the cookie crumbles.