Y'know it occurs to me that despite my long history with this franchise, I've played virtually no fan hacks. Moreover and as a result, I have never listed to fan-created music.

As a newbie to this and for others like me, what are some of the best pieces of music in a Pokémon fan game, or otherwise fan-created original music?

https://www.youtube.com/watch?v=dsXPnSQegS8

This must be a whole world I've never stepped into before.