Undocumented Items

When I go through a route, I double check the wiki page to make sure I didn’t miss an invisible item. I’m more than willing to check every drawer and house plant in a city, but you’re wrong if you think I’m going to check every 1/4 inch of bark in a forest. I was going through Route 8 and I found a Rare Candy South East of the fence in front of Utira Town, it wasn’t even invisible, it was just behind a tree. I didn’t think anything of it until I checked the wiki page and saw that there was no mention of the Rare Candy. Do any of you readers know of any other items like this in the game?