Where Can I Find Bonsly In Pokemon Platinum?

I don't know if there are any other ways, but I found my BONSLY in the trophy garden. Different pokemon appear in the trophy garden. I go there everyday to check out the different pokemon, that I wouldnt normally see anywhere else. To check what special pokemon is in the trophy garden, go to the man in the purple suit (I don't remember his name). To get to him, go into the Pokemon mansion on route 212. Then, once you're inside, go to the right, and enter the first door you see. There should be a nurse standing next to that door. The guy you need is the one right in front of you (in the purple suit :P) Talk to him, and answer 'YES' to all of the questions he asks (there is only 2 or 3 questions that he asks, I think. He will then tell you about a pokemon that humped his leg or kissed him on the cheek or something. Thats the special pokemon. Then, the old man next to him will run off somewhere. If you need the pokemon that the guy in the purple suit mentioned, go into the trophy garden (at the back of the mansion), and look for him.  He is rarer than the other pokemon there, so it might take you a little while to find it.
Hope I helped :)

You can get sudowoodo from the route near pal park. I think it was 227. Then you catch a female sudowoodo and breed it at solaceon town while holding an incense (I think it was rock incense). You can either breed it with a male sudowoodo or any pokemon that is male from the mineral group. Eg. Graveller, golem etc

You can find him in the trophy garden

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I av no idea I think you have to get it from an egg somehow because ive never seen it in the wild before =D

Go to the day care lady but don't go in side go up and theres grass there look in there and you will find it.

You can breed the pokemon while sudowoodo is holding rock insense or 210 or 209

Breeding with Ditto will NOT work for bonsley. There are a few others you cannot breed for thier baby forms. So good luck getting them. The poke mansion is the best place

Or you could breed sudowoodo with ditto

Go to Route 222 or Route 227 and you can find either Bonsly or Sudowoodo

Look on route 222, or the one leading to Pal Park. They can be found wild.