For just a random Dream Ball female Cleffa with no Egg moves or nature or anything, another Dream Ball or Apricorn Ball female would work, or a Power Item.
I have a calm cresselia and sassy cresselia. And I have a modest, timid, and calm thundurus. All the IVs are 31 but thundurus speed IVs are 30 (for HP ice) and the sassy cresselia's IVs in speed are 0.
just to let you know the tourney for the club starts soon! make sure you vote for your favorite tourneys! you have two votes for the tourney and the tourney ideas are on the second post.