This run looks very interesting, and I want to try it out. Any tutorials on the route, and on telejumping in general? Also, what version of the game is it? Help would be appreciated, thanks! :)

The route is simple enough, you can watch the record run and just follow along. The easiest way to do telejumps is by pressing Enter + R on the same frame (takes a couple tries at first), then holding right and mashing flip. This is somewhat consistent for some of the telejumps but two of them are a bit more precise. Pokecrafter64 made a short video explaining how to do them if you look in the guides. I recommend playing around with telejumps a bit, they take a little while to get used to.

I recommend playing on version 2.2 but 2.0 is also fine.