a few doubts about zelda: Phantom Hourglass

hey, i have a few doubts about this game:

Wifi doubts:
1) How can we trade stuff? if this can only be done at a later stage, at which stage can we do it?
2)Can we trade money?

Other doubts:
3) How many times do v have to visit the temple of the ocean king?
4) can we permanently increase the base time in our phantomn hourglass to more than 10 minutes?(i dont mean temporarily by collecting gold pots,m etc.)
5) can we kill phantoms?
6)are there any enemies we cant defeat?

Thanks!!!

k, thanks! btw, one more doubt please: 7)can i still get the feather stylus if i register my game online? thanks!CD_freakazoid

I'm not sure. I believe that was done around the time the game was released, so there's a chance that those aren't being offered anymore. Though, I could be wrong about this. I'd suggest you register the game and see what happens.