I thought Fearow was better than Pidgeot for some reason. Maybe because I thought Drill Peck was Ground, when that was actually Drill Run! Either way, it doesn't have the best nature, so I suppose you were right to box it.
Hmmm... I suggest you troubleshoot what happened, even if it was the result of human error, & learn from that. That way, you'll be unlikely to lose saves again.
Chapter 6.5 - Filler Spoiler Thankfully, I found the save file. Unfortunately, it is only up to after Brock's victory, so I went and caught a Spearow and Zubat.