Theres a trainer on route 216 that has one
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thers one on route 210 a guy dressed in black and cap
It is a wild Pokemon, so no, it does not belong to a trainer. You can't catch other trainer's Pokemon.
You can see Sudowoodo in these locations: Route 209 - PKMN Breeder (Male) Albert (VS Seeker Rematch, 2nd change) Route 216 - Ace Trainer (Female) Maria Route 221 - Wild (25% chance)
route 221
The trainer on Route 209 has Cleffa in Pokemon Platinum. Cleffa is a fairy type Pokemon and can evolve into Clefairy.