They do not have to be ev trained or leveled. 1 mil each.
Vullaby:
Ability: Overcoat
Boon: Speed
Bane: Special Attack
20+ Def, SpDef, and HP IVs
Shellos:
Ability: Storm Drain
Boon: Special Defense, or Defense or HP
Bane: Attack
20+ Def, SpDef, and HP IVs
Lilipup:
Ability: Pickup (Will turn into Sand Rush if I get it as a Stoutland)
Boon: Speed or Attack
Bane: Special Attack
25+ Att IV
Drilbur:
Ability: Sand Rush preferred, Sand Force still works
Boon: Speed preferred if Sand Force, Attack preferred if Sand Rush, but either is fine
Bane: Special Attack
20+ Att, and Spd IVs