Potential rare Gen 3 spawns that aren't meta relevant

If you were to look at your nearby, and saw a non meta-relevant mon, what would it have to be to be worth going out of your way to get it?

I.e. any Metagross/Gardevoir/ Salamence/Aggron stages are obviously worth it (imo), but what about e.g. Minum/Plusle or Seviper?