Standard Mix Giratina-O (248+ Atk / 252 SpA) vs... 0/4 Starmie: Draco Meteor is a guaranteed OHKO. Shadow Sneak does 71% min. 252/0 Starmie: Draco Meteor has a 50% chance of OHKOing. Shadow Sneak does 57% min. If you're using Starmie to take on Giratina-O... I just really don't see that working out for you.