Ninja Five-O is a really fun game thats often overlooked.

Other than that you cant go wrong with Mario & Luigi, Fire Emblem (either one), Advance Wars (again, either one), Final Fantasy Tactics Advance and Pokemon.

Mario Golf and Mario Tennis for Gameboy Color

(Mario Golf is coming out Oct 11th on the EShop for the 3DS as well...)

The Mario and luigi games are great. So are the Castlevania and Metroid games.

I really like the Final Fantasy rereleases.

Oh and MOTHER 3. Except that is a game thats in japanese and you'd need to import or get it by other means. People did make an english patch. I love that game.

Ninja Cop is G.O.A.T.

@myketuna: I totally just bought that after looking it up. Would have never found it otherwise.

@coakroach: I just looked that up, immediately checked eBay and saw that they go for way too much money.

@TooWalrus said:

That Banjo-Kazooie GBA game is pretty... uh, it's really somethin' else.

Oh wow. You reminded me that game exists. Now I really feel the need to see if my friend still has his copy, and it's probably your fault.

On topic: Fire Emblem, probably. Which one? Both of them. There was a third GBA game that only came out in Japan, but I'm not going to go as far as to suggest that you import a copy, though that also has to do with the part where it's one of the weaker games in the series.

EDIT: Also the Final Fantasy ports are pretty great, though V is probably the most valuable because the only other english version of that game was part of that PS1 anthology.

@TooWalrus said:

That Banjo-Kazooie GBA game is pretty... uh, it's really somethin' else.

Oh wow. You reminded me that game exists. Now I really feel the need to see if my friend still has his copy, and it's probably your fault.