Anyone got a spare Mega Gyarados Stone?

I have the following Dittos plus 5/6 Poliwags:

1 **TAKEN**
2 ATK SPD SPE
3 **TAKEN**
4 **TAKEN**
5 **TAKEN**
6 **TAKEN**
1 **TAKEN**
2 **TAKEN**
3 **TAKEN**
4 HP DEF SPD
5 **TAKEN**
6 ATK SPA SPD
1 HP ATK SPE
2 ATK SPA SPD
3 ATK DEF SPA
4 DEF SPA SPE
5 ATK SPA SPE