Now that Flutter is getting banned, you can replace her with Icy Bundle. Here are his best three sets
Iron Bundle @ Leftovers Jolly
Sub, Encore, Freeze Dry, Hydro Pump
Iron Bundle @ Booster energy Modest (suitable Tera for your team)
Agility, Hydro Pump, Freeze Dry, Ice beam/Sub/Tera Blast
Iron Bundle @ Choice specs Jolly (suitable Tera for your team)
Hydro Pump, Ice Beam, Freeze Dry, Flip Turn/Tera Blast
The first one is really good in this sucker punch and priority era. In hail he gains retarded defense since he has base 110 def.
