I recommend injecting the Wonder Card and getting the Pokemon the normal way in game. That way you can be sure everything is correct. Check out the Gen VI Event Contribution Thread. The compilation is attached to the first post. Once it is unpacked, go into PKHeX and load your save. On the bottom right is a button labeled "Mystery Gift" and it opens the window you can use to inject the .wc6. Click on the "Import" button and navigate the the desired .wc6. Once opened, you will see the details for the Pokemon in the Wonder Card. Right click on the first empty Wonder Card slot and click "Set", just as you would if you were saving an edited Pokemon. Click "Save" when done and don't forget to export you edited save so it can be loaded on your game card. Once you load the game go to a Pokemon Center and receive your event as you normally would.
If you haven't already, I recommend reading these two guides on how to edit Pokemon in a way that maximizes their legality. This community does not condone using significantly hacked Pokemon with others unless they are aware they are hacked. That being said, the only case I am aware of where people getting in trouble for using hacks is in official tournaments. There are plenty of people using obviously hacked Pokemon online in battles, the GTS, and Wonder Trade.
