I did an All-BP run of Paper Mario 2. The only rule was that I had to upgrade my BP at level-ups, never my HP or FP. Wearing HP and FP Pluses was allowed.
Ultimately it became my first Danger Mario run, and after I gained the privilege to buy Power Rushes at the Pianta Parlor the game took less effort than smacking a baby (not that I'd ever do that!).
I wanted to do a Nuzlocke run through SoulSilver--you can only ever catch the first Pokémon you meet in each area and any Pokémon that faints counts as dead and can never be used again. I forgot that Falkner's team was leveled higher than in the original Gold and Silver and he kicked my ass. Then I decided "That's bull[dukar], I'm gonna continue," but the game froze and my save reverted to an older one. Yeah, it's what I get for pirating the game, but I'm sure as heck not erasing my HeartGold file.
It's disappointing, I had a Pokémon for each of the Fantastic Four. The Cyndaquil was Johnny, the Sentret was Reed, the Geodude was Ben and the Gastly was Sue. Then I had a Weedle named Isabela but that refers to something else entirely