What do you think they are?
For me, I am going to say Pokemon, FF:EoT, Mega Man Star Force 3, (would like to say jump ultimate but bleh wifi sucks due to so many hackers and big 3 users...if you know what those are) and...iono bafter that lol
What are your favorites?

Ive only done Soul Silver and Mario Kart on the Wifi

But i do enjoy playing games with my GF and her 2 little sisters conecting in the same room
There actualy the reason why i bought one over a year ago

I liked phantasy star zero

whats that like?
Maybe ill pick this up latter, im getting Super Mario bros (the new one that came out over a year ago lol)
Super Mario 64 DS
Children of Mana

Have you played any other Phantasy Star games?
You make a character. There are 3 races.
You pick a class. And a weapon.
There are a lot of weapons, swords, guns, fists, etc.
On wifi, you do some quests with people and just
look for some rare equips and stuff. There are also
Phantasy Star games for PSP and Phantasy Star Portable
2 is being released next month and its pretty awesome
if youre a phantasy star fan.

ima give it a try, games what 30, 40$?

yeah still around 35
iono i didn't really like it
the hopping animation was annoying to me personally
the game will last you couple o'hundred hours tho

Final Fantasy Crystel Chronicals Echoes Of Time
hands down best online on ds ive played
besides the mk ds ofc
and Custom Robo is pretty fun too
pokemon ofc

what's mk ds?

Custom robo on the gamecube was fun