What pokemon spinoff games are compatible with the standard nuzlocke rules, or have had nuzlocke-like rules defined for them?
I've personally been wondering about doing a nuzlocke in Mystery Dungeon, but I have no clue how to apply the "first pokemon encountered in location" rule. Do I only recruit the first pokemon that's willing to join? I could theoretically manipulate this by not fighting pokemon that I don't want to catch. Or should I memorize what was the first pokemon that appeared on screen when I entered the location, and then only recruit this particular pokemon, whenever it offers?

Additional question:
Has anybody tried nuzlocking non-pokemon 'mon games? Digimon, fossil fighters, etc? How did that go?