First if all, thanks to Nevecour for suggesting a capture contest event and thanks to AngelBW for helping me set it up.
There will be four different Pokemon to catch all increasing difficulty and each one will have its own prize!
Reward - Item crate key
Reward - Item crate key + Shiny crate key
31 SP.atk OR 31 Speed IVs
Reward - Shiny crate key + Master ball
Reward - Item crate key + 2 Shiny crate keys + Master ball
Best of luck to you all!