Well, since you have rain dish, you can make him a annoying healing ludicolo. I would have a moveset like this:
Ludicolo @ Leftovers
Ability: Rain dish
Evs: 252 Spe / 252 Sp.Atk / 4 Def
- Giga Drain
- Leech Seed
Surf if your paired with Politoed. Otherwise, rain dance works too. Giga drain has Stab damage AND healing which is great. Substitute walls and if your predicting status. Leech seed makes you even more annoying. Leftovers and Rain Dish is double the leftovers healing and leech seed if you set it up plus Giga drain causes problems to many.