Figured I'd make a page for this on Neocities since I can't be bothered to log it into my normal website.
I have no idea; I'm not affiliated with them and in fact I had never seen a video of them until the original video surfaced on my YouTube feed.
Apparently they make deltarune/Pokémon fusion songs? I don't know anything about deltarune (and have no interest in engaging with it at all, so don't ask) but they're probably pretty good songs. No clue, haven't really watched em outside of making sure they're not part of whatever this ARG riddle thing is.
The video is purported to be a file on vls's hard drive, labeled "top_5_coolest_pokemon!!!!1!!!!_awesomesauce471", with no knowledge of how it was put there.
The caption at the very end links to a higher-resolution version of the video that lets you see, among other things, the Unown text (see below) at a higher quality.
If you use the Spanish (Mexican) subtitles, the caption at the very end is the end of a YouTube URL that links to the version of the video hosted by awesomesauce471, now unlisted. Keep this channel in mind.
I'm not sure if there are any other Unown comments, I did scrub through it a bunch, but I feel like I might be missing one or two.
The description of the video is both reversed and a Caesar cipher shifted by five letters. You can read the full, unreversed and decoded text in the comments of this HTML, along with the URL of the video. I've hidden it so you can find it yourself, but if you give up you can just check the page source.
Who is vls!/vlsknxght?
The original video
The Unown text
awesomesauce471
The only post on the awesomesauce471 channel is a post about Snowpoint Temple. There are three images; two are standard images, the third with Regigigas is secretly a much bigger image with reversed text on the bottom left. Hard to see on my monitor but once I looked at it on my phone it was way easier to see. You may also have to open the image in a new tab by right-clicking and selecting that option. This is the end of a YouTube URL, again, that links to the final page of the puzzle.
mus_crappypiano