Trigger's PC is a save editor, same as PKHeX is. Trigger's PC just does not allow you to edit things.
PKHeX supports Colosseum, XD, and Battle Revolution. Open two instances of PKHeX, one save file in each. You can drag & drop between the two windows to "trade". It's up to you if you delete/clone. In PKHeX, you can also unlock the boxes for the save file by specifying a Trainer ID and SID for the selected save slot.