Here is what I can think of.
1: Super Smash Bros. Melee ( this is the big one, I have had hundreds of hours of great fun with this game, this game is a must have for Gamecube owners )
2: Pokémon XD: Gale of Darkness ( this gamecube Pokémon game is significantly better than Colosseum, and Dark Lugia/XD001 is really cool
)
3: Pokémon Colosseum ( I am a big Pokémon fan, any Pokémon game I own, I like to a pretty good degree, this is a pretty good Pokémon game, but I was expecting a bit more from a Gamecube game )
4: Mario Kart Double Dash!! ( quite a fun racing game, enjoyable, and the controls are pretty good )
5: Mario Party 4 ( overall a fun game, has some enjoyable mini-games in it )
6: Super Mario Sunshine ( a pretty good game, but I enjoy the old Super Mario 64 more than this Gamecube game )
7: Star Fox Adventures: Dinosaur Planet ( an exceptional game, very enjoyable, the graphics are very good, and there is no lack of talking in it )
8: Timesplitters 2 ( a very good game, this game can bring hours of fun )
9: Soul Calibur II ( a very good game, and you can play as Link ( only in the Gamecube version )! )
10: Sonic Adventure 2 Battle ( a very good game, very enjoyable, and the little kids ( or anyone, including me <_< ) can enjoy raising Chao in up to 3 different Chao Gardens )
11: Sonic Adventure DX: Directors Cut ( a pretty good game, better than Sonic Heroes, not as good as Sonic Adventure 2 Battle )
12: Sonic Heroes ( to me, I find it disappointing... )
13: Tiger Woods PGA Tour 2003 ( it's good, but Tiger Woods PGA Tour 2005 is a very big improvement )
14: Tiger Woods PGA Tour 2005 ( this is an excellent golf game, it is my favourite sports video game )
15: The Legend of Zelda: Wind Waker ( a pretty good game, but I really don't feel like I am playing a Legend of Zelda game when I play it )
16: Nascar Thunder 2003 ( I absolutely never play it )
17: Madden 2002 ( it's actually a game of my father's, I never have really been into Football )
18: Madden 2005 ( also my father's game )
19: Star Wars: Rogue Leader Rogue Squadron II ( one of the games that my brother got )
20: 007 Nightfire ( also a game that was asked and gotten for my brother )
21: Resident Evil 4 ( Definitely my brother's game, in general I do not like this kind of game, that is the case with RE4, but right now my brother says Resident Evil 4 is his favourite game of all time )
22: Resident Evil 3: Nemesis ( also definitely my brother's game )
23: Resident Evil 2 ( definitely my brother's game...again )
24: Blood Rayne ( this as well, is my brother's game )
25: The Incredibles ( a pretty good game, The Incredibles movie is very good though )
26: Fire Emblem: Path of Radiance ( a very good game, but not if you don't like reading a lot, my brother can't enjoy it at all... )
That's 26, I think that may be all of them, I have a few comments for each game, to make the post that much more worth while.
And, since I am going to be getting it for Gamecube, I have to say it, for my birthday in less than a month, I'll be getting..........Digimon Rumble Arena 2...yes, among the so many games that I like, Digimon games is one of them, also, I have rented ( for free ) Digimon World 4...13 times and counting, I had to say it sometime, please do not let it bother any of you, I know it isn't too popular...>_>