Ummm, where to begin...
1. The 4th Link Stone(for me at least) is the same one which was at the rock outside the destroyed Yurreu HQ. Basically the event respawned, so if you took the stone back in episode 9, you can get it again.
2. There is a lady sitting on a bench wearing green that teleports (if she hasn't teleported just do circles near her until she teleports) and appears at the forest. If you give her medicine she will go back to spinnel town and she will give you a sticker. Again this event reset, resulting in her giving you a second sticker if you already had taken one in ep.9.
Whew