I only had trouble grinding without VS. Seeker. I remember looking at serebii for trainers that I could call on weekdays. Though sometimes, I would switch days forward on my DS. XD I also, actually, had trouble with catching them all. I was trying to get every single pokemon possible in HG. Some pokemon were by swarm, so I kept trying to switch days, but sometimes it would be relicanth, and then the next day would be ditto, then relicanth again. So it was a bit annoying looking for that snubbull.