Well, It's really a matter of money. I would think most people aren't gonna go for the full pokedex anymore because there are like 500+ pokemon now, so trading to fill the pokedex is definately worth 35$ if your THAT hardcore. but If your battling competitively I wouldn't say that it's worth 35$. Just ask your friend to borrow their game if they have b/w, that way you can use theirs on the extra DS. To sweeten the deal for them, let them do the same with yours