Where do you catch Farfetch'd in Pokemon Soul Silver?

The best place to find farfetch'd in Pokemon soulsilver is route 47. However, never look for farfetch'd at night, because it will be impossible to find one. You could also try the wetland area of the safari zone (no objects needed, e.g. rocks, flags etc.), but the same rules apply, you won't find it at night.

Hope I helped!