i dont know about shaymin-i was gonna get the event but i was in asia at that time. But,
i have a darkrai (from pokemon rangers shadows of almia) and i use it all the time.

i use darkrai all the time, and idk about shaymin becuase i missed the event but probly

i use a shiny darkrai my hacker frnd traded me for a magikarp (lol) and the shaymin works
too