Is this Gen V or Gen VI?
Encore is a preferred option on Whimsicott to stop setup sweepers:
-Encore
-Stun Spore
-U-turn/Memento/Substitute
-Taunt/Moonblast/Leech Seed
Nature: Impish/Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Prankster
If it's Gen VI, use Knock Off over Crunch on Krookodile. The move got buffed big-time to power up if the opponent is holding an item.
ChestoRest Kingdra isn't as effective now because of the Fairies running amok:
-Dragon Dance
-Waterfall
-Outrage
-Substitute/Iron Head
Nature: Adamant
EVs: 24 HP/252 Atk/232 Spe
Item: Leftovers/Lum Berry
Ability: Sniper
or (critical hit mechanics got buffed in Gen VI to always cause a critical hit in combination with Focus Energy + Scope Lens):
-Focus Energy
-Hydro Pump/Surf
-Draco Meteor
-Agility
Nature: Modest
EVs: 24 HP/252 SAtk/232 Spe
Item: Scope Lens
Ability: Sniper
Use Dark Pulse or Shadow Ball over Ice Beam on Mew, as Slowbro walls you without either move; they also cover opposing Psychics.
Sheer Force is always the preferred ability on Nidoqueen. Even though Nidoqueen's Special Attack is marginally lower than its physical Attack, all its Special moves benefit from Sheer Force, meaning that they hit harder than its physical moves:
-Stealth Rock
-Sludge Wave
-Earth Power
-Ice Beam
Nature: Modest
EVs: 128 HP/252 SAtk/128 Spe
Item: Life Orb (Sheer Force cancels Life Orb recoil if an offensive move that benefits from said ability is used)
Ability: Sheer Force
Eelektross has a more reliable Grass move in Giga Drain, which helps offset its lack of reliable recovery:
-Thunderbolt/Volt Switch
-Giga Drain
-Flamethrower
-Acid Spray/Hidden Power (Ice)/Knock Off/Superpower/U-turn
Nature: Modest/Quiet
EVs: 252 HP/252 SAtk/4 SDef
Item: Assault Vest
or
-Coil
-Thunder Punch/Wild Charge
-Drain Punch
-Aqua Tail/Dragon Tail/Knock Off
Nature: Adamant/Careful
EVs: 252 HP/252 Atk/4 SDef (Adamant) or 252 HP/4 Def/252 SDef (Careful)
Item: Leftovers