Answer:
In the Sinnoh pokedex barboach.... In the National pokedex is Slowbro.
You probably ask this to know where to get them:
-Barboach can be found with a good rod just about anywhere:
1. Eterna City
2. Mt. Coronet
3. Marsh Game
4. Ravaged Path
5. Underground Oreburgh City
6. Route 205
7. Route 208
8. Route 210
9. Route 212
10. Route 227
11. Route 228
All of these can be found any time of the day, generally at 30 to 35% appearance
Slowbro is different. To get him you must use the pokeradar in 205 north and be using pearl, as it will NOT appear in diamond. It generally is found at 11-12 in level, and has the same probability of appearance.