How do you give someone items after you sell them?

[AnakinPhoenix]

I do not understand how that would work. Please help!

 

[Dom]

After the PC is transfered you add eachother's friend codes and trade in game

 

[Brock]

I do not understand how that would work. Please help!

You trade the items to them by exchanging friendscodes and trading in ORAS or XY when borh of you are online

 

[Krelbit]

Attach the item to a pokemon and then send that pokemon.

 

[sebesmos]

I do not understand how that would work. Please help!

Attach the item to a pokemon and then send that pokemon.

As Krelbit said you have to attach them to a pokemon. You generally want to use "fodder" pokemon that aren't of any value.