So, I'm a proud owner of a 3DS. Unfortunately, I missed out on the DS, and, as I have some money to blow, I was wondering what the 5 best games for the DS are if you already have a 3DS? I'd prefer not to have any games that may spoil the thrill of upcoming 3DS games... ie Not Super Mario 64 so that the new Super Mario is a totally new thing for me.
Thanks for suggestions.

Zelda spirit tracks, Zelda: phantom hourglas, Mario and Luigis bowsers inside story, Sonic coulors, Kirby superstar ultra and Metroid prime hunters.

in any order.

1: Pokemon Black/white
2: Okamiden
3: Yoshi Island DS
4: Legend of zelda: Phantom hourglass (People hate on this and spirit tracks but there is a good chunk of gameplay in it and I found them quite fun)
5: Super scribblenauts

A few others..

Elite Beat Agents
The legendary starfy
& Pretty much any Professor Layton game

Any Pokemon
Starfy
New Super Mario Bros.
Mario Kart DS

Uh... that's all I can think of.

Megaman ZX Advent
Castlevania games
Sonic Rush
Assassin's Creed
Contra 4
Kirby Squeak Squad
Phoenix Wright - Ace Attorney
that's a bit more than 5 but still...

Pokemon Black/White
Pokemon Heartgold/Soulsilver
Prof. Layton and the Curious Village
Prof. Layton and the Diabolical Box
Prof. Layton and the Unwound Future
Chrono Trigger DS
Final Fantasy Tactics Advance 2
Kirby Super Star Ultra
Dragon Quest IX

whoops I put more than 5
oh well...

Mario Kart DS:

Extremely fun with local multiplayer. I don't use online much so I can't tell you about that.

Pokemon D/P/Pt/HG/SS/B/W

Get any NDS Pokemon game, Black and White are the newest though.

Mario and Luigi: Bowser's Inside Story

Great Mario RPG game with good humor. Some of the lines that the characters said in this game literally made me lol :D

Super Mario 64 DS

This won't ruin the new Super Mario storywise. The stories are going to be different. It's like the difference storywise between 64 and Galaxy.

Chrono Trigger
Professor Layton and the Curious Village
Phoenix Wright: Trials and Tribulations
Castlevania: Dawn of Sorrow
Henry Hatsworth

Everyone else's lists are wrong

Original, awesome experiences on the DS:

Elite Beat Agents
Picross DS
Rhythm Heaven
Henry Hatsworth

Awesome games series that originated on the DS, but will be coming on the 3DS:

Phoenix Wright
Professor Layton

Awesome series with games on the DS, and may come to 3DS:

Any Castlevania DS Games
Grand Theft Auto: Chinatown Wars

Awesome series on the DS, confirmed for 3DS:

Mario Kart DS

Rad Remakes:

Pokemon HeartGold and SoulSilver
Chrono Trigger
Final Fantasy IV

and I'm still probably missing a bunch

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1 advance wars days of ruin
2 advance wars ds
3 mario kart
4 yoshi touch and go
5something random - get trace memory