It depends on who you're fighting really, but as a general move-set, I would pick this
Blissey :
Ice Beam
Hyper Beam/Thunderbolt
Seismic Throw
Softboiled
(Since you're having Kingdra on your team, and a Hitmonchan, Ice Beam/Seismic Throw can be replaced with Rest / Sleep Talk.)
Kingdra
Ice Beam/Blizzard
Dragon Breath (I'm not sure of Kingdra CAN learn Flash Cannon)
Hail/Toxic
Hydro Pump
Houndoom
Crunch
Fire Blast
Shadow Ball
Sludge Bomb/Sunny Day -(Which helps Espeon, but not Kingdra)
Espeon
Psychic
Morning Sun
Iron Tail
Hyper Beam
Muk
Sludge Bomb
Mud Bomb
Thunder/Thunderbolt (If you still chose to have Rain Dance, Thunder will never miss)
Flamethrower (Sunny Day)
Hitmonchan
Ice Punch
Focus Punch
Thunder Punch
Drain Punch
It's pretty focused on ice/fire moves, but Surf is a good alternative to Kingdra. Hitmonchan can also learn Rain Dance, but I wouldn't advise it.
--CapsLock--