What to get... FF XIII vs Pokemon soul silver..

[leo-j]

So I'm going to gamestop in a bit, and Idk what to buy..

 

I am getting FINAL FANTASY XIII for sure, but idk what else to get..

I am thinking either INFAMOUS or POKEMON SOUL SILVER..

Infamous is $29

SS is $39

can I get soul silver without the poke walker? How much is it USED? Also which do you recommend if you have both? How long is infamous? How long is soul silver? How long is FF XIII?!!?