The first (I think?) game vs game contest, between the main games from Generation III, released for the Game Boy Advance.
Here are some optional questions to help you deciding and elaborating your post:
- Which set of games had the best Pokédex and Pokémon distribution?
- Which set of games had the best soundtrack?
- Which set of games had the best storyline?
- Team Rocket or Teams Aqua and Magma?
- Do you prefer the Hoenn or Kanto 'boss characters'? [aka rivals, gym leaders, elite fours and champion(s)]?
- Trainer's Eyes or VS Seeker?
- Lastly, which of those games do you like the most?