The Emerald Rogue romhack kind of came out of nowhere to me, but it's absolutely incredible. Has all the features I'd ever want, runs super well in pretty much any GBA emulator (and thus my emulation handheld), is highly configurable, and has a solid difficulty curve.

You can even seed a run in the config room, so here's a seed for the thread:

Adjective > SHREDDED
Pokemon > Crobat