ohh okay, i was trying to trade with platinum. so does that work if i put platinum in the 3ds and play it?
No in order for that to work you would need the pokebank app from the nintendo store, which is $5/year. Even then platinum wont work since "i think" pokebank only trades from pokemon black/white2 to gen 6 games.
Dont worry tho, pokemon are much easier to come by on the gen 6 games. There are also event pokemon coming out every month this year from mew - genesect. So if you have a gamestop or something similar, just walk in and ask, they will give you a free event code. The trading on this site is also very helpful if your missing certain pokemon, most of the legends are on ORAS, and if your feeling lucky the gts or wonder trade works too.