Then it should be easy as long as you can hit a seed :D
Safari Zone abuse in HGSS is sooooo easy. You just have to save in front of the man who lets you into the SZ, and hit your seed. Once you've confirmed your seed (While confirming your seed, be sure to keep track of what frame you're on) talk to the man and get into the SZ. Use a repel, and go into the grass / water or whatever and check what frame you're on, do your advancements, and Sweet Scent! Then... you have to hope the pokemon you want shows up, since there are no encounter slots mapped out. So seeds where your target IVs / Nature / Ability etc. are repeated work great!
Oh lol. Well if you think you can be taught without actually starting over, let me know! And, if not, just tell me when you get the used HG and I'll help :)