Hey, thx for the helpful guide :Grin:
Yorkie's brother was for me next to the power plant as in the picture you attached. Concerning the item, I used my Butterfree with compound eyes in 1st place and my Ursaring with the Covet move to steal it. After approximately 10 billion Grimers and Rattatas, I finally encountered the holy Pidgeotto with the Nocturnal feather. It took me about 20 Pidgeottos to find it (approximately 7 hours in Poké Time).
Quick suggestion to help the next ones : Since you can only find the item on Route 16, you should probably add to your guide that Pidgeottos only appear during the morning/at night on this road... I personally didn't know it and I spent a moment running around in the grass during the day without encountering a single Pidgeotto :Smile:
(For all I know you could be saying it in your video but since I don't understand your language... :Shy: )
Hope this helps !