From Before I Play
- Once you get a magikarp, make it your buddy so you collect candy with adventure sync. You will need a ton of them later. This will take months, so might as well start ASAP.
- Turn on adventure sync, if you're on IOS make sure it has read permissions to Health. It will not do this automatically in my experience. This will allow you to hatch eggs and get buddy candy just for carrying your phone around
- Do not evolve Grimer, Magikarp, Gloom, or Magnemite until you get a quest for it. Otherwise you may end up sitting on that quest for a long time if you don't have the candy for it because you used it already and it happens to be a time where they don't spawn as much.