Mine was Wild World! I did see my best friend play the Game Cube version but my family didn't have a GC and when I got the DS, I bought WW. I also get CF for my Wii. I played both games for years and finally decided to get New Leaf maybe a year and a half after it released because I was so hesitant to buy it, hah! It was one of the best decisions I've made, though.
Mine was the Game Cube Animal Crossing but I was soooo young when that game came out. I barely remember it. All I remember is going down to the video rental shop every week to get the game haha
Animal Crossing on the GameCube. It's kinda disappointing that so many people here never played that one. It's widely regarded as the 2nd best AC game behind New Leaf. I'd recommend trying it if you haven't already.
I remember never having any money in that game, EVER... everything seemed so expensive to me, even just the less-than-5k-Bells stuff...!
I can't tell if it's just easier to make money in New Leaf, or if I was just a dumb kid back in the day. v___v