So I went through on my promise to play through boss rush of Mega Pony for my channel. I also mentioned a few things here and there that I heard from the creator in a response PM to some feedback I had on Mega Pony.
Note: I meant RIGHT SIDE, when talking about a "safe zone" for fighting Discord. And what I was trying to say about Discord was something told to me by MercenaryCobra1: Final Discord suffers from Air Man syndrome. You can get behind him - on both sides. As I discovered for myself with experimentation, the right side offers more breathing room, but the left side is more suited to Rainbow Dash's dive kicks. At least in my experience, anyway. This was also how I came to discover an absolutely safe zone for dealing with final Discords desperation attack.
Note 2: Not the best I can do, I'm sure, but this run wasn't for breaking any records, competitive or personal. Oh well. I was just hear for fun. No surprise! Heh.