he is near mossdeep city. to be exact he is @ route 124. u need to go to where the trees and sand is, right at the edge of mossdeep. surf upwards and after about 5 steps u will see a plot of small land. the hunters house is there.
Near Mossdeep City island.
Surf west from Mossdeep City.
He lives on a small island in the water between lilycove and mossdeep
There around the hunters house west from mossdeep city. You need the HM dive to find them.
Route 124, west of mossdeep city.
he isn't in ruby/sapphire/emerald
what pokemon?but if its in POKeMON Ruby its either in verdanturf or petalburg
You can exchange them for water shards at HUNTERS HOUSE near mossdeep city. You can give your water stone to staryu and it will evolve into Starmie! NOTE: THIS IS FOR POKEMON RUBY! -Sammi out! :P
At your moms house
in mossdeep city
route 110
at the faq house
in petalburg city
house next to the Pokemon center