You catch Barboach using a good rod. He can be found in the areas of the link provided.
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there are many places to catch a barboach but where i caught mine was by eterna city sort of where the fishermen are,you have to use a good rod
use the super rod in body of waters
You can catch feebas everywhere and occasionally barboach i am unsure where to catch magicarp but there is a way
3 trainers have a Barboach in Pokémon Platinum, one is a trainer on the 2nd floor of the Lost Tower and the other 2 are Fishermen and 1 is on Route 208 and the other one is on the south side of Route 212.
Go to meteor falls and use a super rod.