Ya might want Rain Dish on that Ludicolo. Use Surf instead of Hydro Pump. Follow Lie's advice. Then you should have a pretty sweet Ludicolo.
No. In 2vs2, Hydro Pump (Or Waterfall if you want the accuracy) is infinitely better than Surf. Surf's attack power gets split for each Pokemon it hits. What would you rather have- 120 attack power or 47.5?The trait depends on what you want to use it for. Swift Swim for a sweeper, Rain Dish for a staller. But yeah, Hydro Pump is vastly inferior to Surf, which has three times the PP, hits both foes and is 20% more accurate while losing only 25 power. Enough said. Plus Surf has the obvious out-of-battle use.