I got myself a magnemite with sturdy from shades arena and:
arceus uses focus blast, missed
magbemite uses thunder wave
Magnemite uses metal sound
arceus uses full heal
arceus uses focus blast . sturdy
magnemite uses thunderwave
Magnemite uses metal sound
Arceus uses full heal
Arceus uses judgement
and then i 1hkoed him with my gardevoirs moon blast