is there a way to do online play with NO$gba?

i don't think there is... am i right?

No not yet, in 2.4 (I think), no$gba did have slight wifi support. iDeaS has a wifi plugin which supposedly works, but I can't confirm that.

oh ok so there's no way i can GBA Link up with someone else?

Uh no, not with no$gba, but you can try VBALink (Gba emulator), haven't used it for ages.