Relicanth..yeah kinda ugly...
Gorebyss...ugly? More like a bundle of pink cuteness
Slaking...water pokemon? Though the whole picking nose is just...wrong
Ditto...gotta love the uber cuteness of Ditto
I don't care -- thats also true
All are ugly -- false
All are cute -- oh so false
Pikachu ...water poke? though he is cute.
I don't consider any of the Pokémon of the list ugly, Seaking (If that's what you meant by "Slaking") and Relicanth are actaually some of the Pokémon I like the most.
The ugliest water-type would be West Shellos or Arceus.
BTW, Pikachu, Slaking and Ditto are not Water-type.