I recently came across a colorization that turns the original black and white/green version of Pokémon Red for the GameBoy into a proper GameBoy Color title. This sent me down a bit of a rabbit hole, but the sheer number of hacks that have been made over the course of several decades is slightly overwhelming, so I'd love to get a decent first selection by hearing which are your favorites that have improved or transformed console and handheld games in meaningful or entertaining ways.
Thanks in advance!
Having only touched it once, Emerald Rogue is a genuine roguelike in Pokemon Emerald, though I don't know if it works on a flashcart on real hardware.
I'm using emulation, so this doesn't matter to me. Thanks for the recommendation!