The Pokédex Run is the most basic run. Though this run can be a bit more time consuming. The idea of the Pokédex Run is that you have to catch every Pokémon that’s not in your Pokédex yet. You also have to trade with others in order to get some trade evolutions and version exclusive Pokémon. The goal of this run is to complete the Regional Pokédex before you take on the Elite Four.
The only rule is to Catch ’em all.
Emberjaw 