on Wednesday the 2nd 2011 on Pokemon talk prof oak will tell you that you get them by using your {old rod good rod super rod} and you get them in violet city.
in spere pillar
At level 45.
you talk to wishcash.
After you have defeated rayquazza you talk to Lombre then to wishcash and wishcash will give you the hm dive and acsess to stormy sea
It is in stormy sea. You'll need the TM Dive, you can get it from Wishcash at the pond.
fish on iron island. Or Elite Four Bertha has one, Or evolve a Barboach.
After you have beat rayquaza go to the wishcash pond and he will tell you about grumball/snuball and how to evolve
catch a barboach by the town fallabar whatever it is soz for the spelling mistake havent played on it in ages
after you beat rayquaza, go to wishcash pond and there should be luminous cave there. go in for evolution.
Wishcash after you beat raquaza and a bit further in the story
Whiscash Pond is not in Pokemon Mystery Dungeon: Explorers of Time/Darkness. It is in Explorers: Red/Blue Rescue Team though.
Barboach.