You can catch it in the Safari Zone. Switch one of the areas to marshland and make sure you have a super rod and have gotten far enough in the game to be able to place objects in the zone. Go to the marshland area and put down 4 water objects in a pool. Then use your super rod until you catch one. It took me a little while but after a bit i decided to leave the pool and try fishing from it not being in the water, and I got one first try. Good luck! :)
#80, Sinnoh Dex: Barboach, found while fishing
In Pokemon Diamond, if you have the sinnoh pokedex(that means you have not found all the Pokemon in the sinnoh region)number 80 is barboach. If you have the national pokedex, number 80 is slowbro. I hope that helps.
barboach? http://pokemon.marriland.com/platinum/pokedex/barboach/ look at the bottom
you can't catch it because you already beaten the legendary
you can catch a lot of unknown Pokemon A-Z
Barboach
Pokemon 80 is barboach.
Pokemon #080 (Sinnoh Dex) is Barboach.
Barboach.
Barboach evolves into Whiscash.
diamond pokedex number 80 is Barboach
Lv.30
You can see and catch a barboach in route 210. You must have defog, good rod, and surf to see him also to catch him so that's where you find him!
it's barboach. You can get it by battling or fishing it with a super rod.
I found pone above mt.coronet cave of ferity pone activates barboach to a Pokemon (like a fossil with cranidos)
The 080 entry is BARBOACH THE FIRST EVOLUTION OF WHISCASH.
use a good fishing rod in a lake