James' One-N-Done Run: Leaf Green is a Pokémon run being attempted by James The Animator.
The One-N-Done Run is a fairly simple run, with only two rules:
- You can only catch one Pokémon on each route. You want to catch Meowth on Route 8? Fine, but you can't catch anything else.
- You can't catch any Pokémon twice. If you want to, you may outlaw catching Pokémon in the same evolutionary line as well.