Do you go through the Nuzlocke challenge through any of your games?
I am currently going through one in Platinum with these rules:
Any Pokémon that faints is considered dead, and must be released.
I may only catch the first Pokémon encountered in each area, and none else. If the first Pokémon encountered faints or flees, there are no second chances.
I must also nickname all of my Pokémon.
A black out/white out is considered to be "game over", even if there are Pokémon left in the PC.
Banning the use of Pokémon Centers, relying only on Potions and healing items for healing. (Maybe)
No catching/using legendary Pokémon.
What rules do you play with?