Quoted By:
Music.
Mt. Battle. Both story and Battle Mode.
Atmosphere.
AI using (basic) competitive strategies in-game.
Not a single obtainable gen I Pokémon.
Evil teams using other Pokémon than Rattata, Glameow, Poison- or Dark-types.
Limitability so you're forced to use Pokémon you would've never used otherwise.
Connectivity to gen III games.
