I plan on doing a challenge run. A mix of nuzlocke and dual type run. There will be a team leader of sorts, I'm trying to think of something that would make him dying mean more than the rest of the team. Only thing I can think of is automatic game over, but that may be a bit much.

Rules I thought of
Nuzlocke rules other than captures
transfer eggs of 8 Pokemon of 1 type and 8 Pokemon of another type
transfer an egg of one Pokemon that's both types
The Pokemon who's both types is the team leader who must be kept in the party