Question

I want to catch some rare pokemon (not pal park or wi-fi)

Answer 1

You could go to the safari zone. it's full of rare pokemon. also mount silver has a lot of rare pokemon. you could also use the pokewalker there are many rare pokemon on it.
Note: to get rare pokemon in the safari zone you need to place certain items in certain areas to get them
http://www.serebii.net/heartgoldsoulsilver/safarizone.shtml