The Legend of Zelda: Phantom Hourglass (got too frustrating; Spirit Tracks is better)
Brain Age (not enough variety and poor handwriting recognition)
Pokemon: Diamond Version (wanted to have fewer Pokemon games; Soul Silver is more nostalgic)
Kirby Super Star Ultra (got too frustrating; Amazing Mirror is better)
Kirby Squeak Squad (got too frustrating; Amazing Mirror is better)
Wario: Master of Disguise (got too confusing; Wario Land 4 is better)
Sonic Rush (Classics Collection is better)
Spyro: Shadow Legacy (just plain awful)
Star Fox Command (controls are awful)
Yoshi's Island DS (got the GBA version via Ambassador Program)
Mario & Luigi: Partners In Time (got really annoying)

You do realize that Yoshi's Island DS is a completely different game than the SNES and GBA ones, right?

Anyways, I no longer own Wario: Master in Disguise, the three Pokemon Ranger games, and Warioware D.I.Y.

None because trading is all too often a rip off so I still have all the DS games I ever bought.

I didn't know that foxes could make troll threads...

• Mario & Luigi: Bowser's Inside Story (so good that I never wanted to play it again )
• Scribblenauts (seriously the most fundamentally broken game that I have ever played)
• Sonic Rush (I like playing games that the player can actually participate in)
• Pokemon Diamond and Platinum Versions (the Action Replay ruined Pokemon for me)
• Mario Kart DS (loved it, but I needed cash and foolishly thought that 7 would be better)
• Professor Layton and the Diabolical Box (my OCD and Puzzle Agent kept me from finishing)
• Kirby: Squeak Squad (100%ed it within 2 days, plus Kirby's been in better games)
• Spectrobes (believe me when I say this was absolutely awful, traded it for K:SS lol)
• Mario vs. Donkey Kong: Mini-Land Mayhem (uninspired design, I own MvDK:MMA!)
• Pokemon Ranger and possibly its sequels (it's a Pokemon spin-off)
• Pokemon Mystery Dungeon and possibly its sequels (it's a Pokemon spin-off)
• Phantasy Star 0 (one of the worst games ever, right up there with Scribblenauts)

I'm sure I've traded in a ton more than that, will update as I remember them.

Planet Puzzle League - I tried to get into it on multiple occasions, but it just wasn't for me.

Yes, but I prefer the original over the sequel. Has more charm to it.

pokemon pearl was my first ds game and i loved it! but was bored with my ds and sold it. years later i bought another ds and now i'm looking for a pearl version with it's box.

I don't sell many games anymore as the 5 bucks usually isn't worth it.

That being said
-Yoshi's Island DS: this game can just go die. Ear bleeding Baby Peach and all.
-Magical Starsign: Or, how to make the least interesting JRPG possible.
-Rayman 2 DS: Remember when 3D platformers on DS seemed like a good idea? Yeah, me neither.
-Mr. Driller: Drill Spirits: Ok puzzle game but nothing great. I sold it because I dunno.
-Phantom Hourglass: Spirit Tracks made this game's existance almost as worthless as the first version of a Capcom fighting game.

None that I can remember but than again I dont have too many DS games to begin with.

commando steel disaster:so hard that i couldnt beat the first level
cartoon network racing:lame and i bought it for 2 bucks and manage to make more from it
don king boxing:pretty hard in many ways
and a few more but cant remember

Harvest Moon DS because I could never get married.

I didn't know trolls can get away for being trolls. Oh wait a minute this is NintendoLife.

Mario Kart DS. Worst Mario Kart ever.

Didnt have many ds games since most of them sucked not the best line up of games..But the ones that i did own were mario kart ds, mario 64 ds,new super mario bros,legend of zelda phantom hourglass,kirby mass attack,pokemon mystery dungeon explorers of time, pokemon pearl,kingdom hearts 358/2 days, sonic chronicles dark brother hood,mario and sonic at the olympic winter games,megaman advent,metroid prime, animal crosing wild world kirby canvas curse.
I never got rid of any of my games but i did lose kirby super star ultra and mario 3 on 3 hoops

lies and more lies and also lies

Some that I can remember:

Grand Theft Auto: Chinatown Wars (The game just became me running around town selling drugs....what's the point, and not a good message)
Mario and Luigi: Partners in Time (The weakest of the Mario and Luigi games and I knew I would never play it again, but still regret selling it)
Metroid Prime Hunters (Worst single player Metroid ever, stopped playing it; never got to enjoy the multiplayer because I couldn't play it online and none of my friends had it; still I regret selling it since it's Metroid)
Brain Age ( got tedious)

You could make a killing if you sell them on eBay, you know. I'm saving my lesser games for eBay lots.

Oh c'mon, at least Phantasy Star 0 isn't completely broken. That'd be like me comparing Star Ocean 3 to Superman 64. No matter how much I hate it, that comparison just won't work.

This can't not be a joke.

Everyone sold some pretty good games, like Yoshi's Island DS and Mario Kart DS. Why?

Anyways, I think I only ever sold Brain Age, but then my cousin was getting rid of DS games so I ended up with it again

It's not uncommon for people to sell good games they're never going to play again. I do it quite a bit, and I can't say I've regretted it.