Hmm what does Shadow tag have to do with Gale wings? :thinking:
As said up there,bring a dugtrio,jolly nature,reversal earthquake screech sucker punch/rock slide + focus sash item and rip blisseys.
[mention]Kaminokage[/mention] Yeah gotta let something die to bring Dugtrio in on Blissey,Screech once,if he has ice beam he will activate the focus sash and that's a free reversal.Obviously if you get frozen.....well there rip.
252 Atk Dugtrio Reversal (200 BP) vs. -2 252 HP / 252+ Def Blissey: 1314-1548 (184 - 216.8%) -- guaranteed OHKO
So yeah,don't bring it on switch in.:p