In response to the Jellicent sets above.
Water Absorb and Cursed Body have different utilities with each other. With Water Absorb, you can run Water Spout easier thanks to easier healing. Run a second Water STAB in case your HP gets to low, like how I run Eruption and Heat Wave on my Camerupt.
Jellicent@Leftovers
Bold - Water Absorb
252 HP/200 Def/56 Sp.Atk
-Water Spout
-Scald
-Protect/Taunt
-Ice Beam/Energy Ball
Protect is to stall Leftover recovery and Burn damage. Water Spout is your primary move to be hitting two pokemon at once without hurting your teammate. Icce Beam or Energy Ball fight for the utility on this moveset, but pick the attack depending on how well your team can handle Grass or Water types who resist Jellicent's STAB. Taunt is an option for Whimsicott who usually don't run attacks.
Now, for my version, with Cursed Body.
Jellicent@Leftovers/Red Card/Rocky Helmet
Sassy/Calm - Cursed Body
252 HP/252 Sp.Def/4 Def
-Scald
-Hex
-Recover
-Trick Room/Confuse Ray
Sassy and Trick room are for TR support. Otherwise, run Calm and Confuse Ray.
A Jellicent meant completely to wall. Thanks to Cursed Body, Jellicent can wall better than most Water or Ghost types. Scald to Burn physical attackers who threaten with harsh SE moves. The EV spread and nature are his only defense against special attackers. When Cursed Body disables their attacks, which will most likely be their only SE attack for Jellicent, Recover your HP and wall all over again. Hex is to get extra damage off of weakened foes, and Confuse Ray is to trip up your opponents who have to resort to other moves to deal damage to Jellicent. Jellicent also makes himself an excellent pokemon to use Trick Room with, being able to recover HP, disable SE attacks, AND spread Burn status in a single set. He's a very reliable TR pokemon for the team.
Both abilities give Jellicent a different function. Water Absorb gives him more synergy in Doubles and provides some ease of effort with water Spout. With that in mind, abuse the potential out of both abilities and squeeze every last bit of potential out of both sets if you can.