Solar Crimson
A Crimson Tide
For me, it's a tie between Super Smash Bros. Melee and Tales of Symphonia (even though it's been a while since I played it). Both games are good in their own rights.
Other honorable mentions are:
The Legend of Zelda: The Wind Waker
Fire Emblem: Path of Radiance
Pokémon XD: Gale of Darkness
Super Mario Sunshine
Paper Mario: The Thousand Year Door
Baten Kaitos: Eternal Wings and the Lost Ocean
Soul Calibur II
Other honorable mentions are:
The Legend of Zelda: The Wind Waker
Fire Emblem: Path of Radiance
Pokémon XD: Gale of Darkness
Super Mario Sunshine
Paper Mario: The Thousand Year Door
Baten Kaitos: Eternal Wings and the Lost Ocean
Soul Calibur II