Go to meteor falls and use a super rod.
you don't need a trainer,you can find one in the wild by fishing
Barboach evolves into Whiscash at level 30.
Barboach is A sinnoh Pokemon which meens you can only have it in Pokemon Pearl,Diamond,Mystery Dungeon Exps of Time and Darkness Actually you can find barboach in sapphire, but you need a super rod. Some of the places you can find it is in meteor falls with the small parts of water, the elite four waterfall/ lake, and i think at the river with the man who gives you the TM roar near lavaridge.
Fisherman Cody has a barboach. He is on route 208 and you have to surf to get to him.
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You can find Barboach at route 7.
Barboach evolves into Whiscash at Level 30 in Pokémon Ruby, Sapphire, FireRed, LeafGreen, Emerald, Diamond, Pearl and Platinum.
Barboach is a serpentine-shaped Water/Ground Pokemon with a 24.8% catch rate. Starting from level 30, Barboach can evolve into Whishcash.
You go onto route 119 east of Fortree where the weather institute is. Fish there either with the good rod (Barboach will be uncommon) or super rod (barboach will be slightly common).
im not lying but my barboach evolved at level 31 so i bet thats what level it evolves at
you have to find barboach or use an action replay
Go to meteor falls and use a super rod.
it is easy. you just catch two wiscash, and hatch a barboach!
The Before form of the Water and Ground type Whishcash is the small Water and Ground Barboach. Barboach is only avalible in Pokemon Diamond, Pearl, Emerald, Ruby, Sapphire and Platinum
If you can't find a trainer in platinum with a barboach, you can fish in Eterna City with the good rod and try to find one, because i know you can find barboach there.
deep sand:sandshrewtrapinchcacneabaltoyrock smash:geodudesurfing:goldeen (emerald)marrilsurskit (ruby/ sapphire)fishing:goldeen (old/ good)magikarp (old/ good)barboach (good/ super)