Its body is covered with a slimy film. The film acts as a barrier to prevent germs in muddy water from entering the Barboach’s body.
– Emerald Pokedex
I don’t know that much about Barboach, never having owned one or even seen one in the wild (haven’t gotten that far in Emerald). Water/Ground is one of my fave type combinations, but Barboach never really caught my eye. It’s not as cute as Wooper or Mudkip (it’s funny-looking, and looks like an old man), and its abilities are both pretty useless.
Although it and Whiscash can learn Aqua Tail, and Spark, so it might be more useful than I first thought, haha.