No you don't. Both are Generation 4 games and since there are no new Pokemon in SS their wouldn't be much point in having a special system. All you need is a second DS and a copy of both games.
If you meant do you need to get to a certain place or thing ingame then all.you need is the poke center after getting your first badge in both games or GTS again after reaching a certain town after getting your first badge.
Hope I helped!!