I recommend Finneon's evolutionary line, especially level lv. 18+ with attract. If you know someone who can link trade with you and has a Poliwhirl and a King's Stone, have them trade the Poliwhirl holding a King's Stone (same thing goes with Slowpoke/Slowking). Vaporeon is also ideal, but you either have to find a Water Stone, or buy one for 3K Pokedollars. Furthermore, Whiscash is pretty awesome, but Grass Knot will do a lot of damage to it. You can also do an island scan at Akala Island on a Saturday or Monday to get a Marill or Spheal, at Poni Island on a Friday to get Samurott, or at Melemele Island on Monday or Wednesday to get a Totodile or a Horsea. Finally, some bizarre water Pokemon are Bruxish, Golisopod, Araquanid, Toxapex, Wishiwashi School Form, Ash-Greninja (even though it is popular/overused, it is still epic), and Gastron. Sorry for the long post! I hope this will help!
