Hey Mateo, great game! Just a question though.
It's not about the game, but the story itself. You say - and the hack shows - that the original Pokemon Gold's events have already happened. If that is the case, then who stopped Team Rocket that time around? It couldn't have been Gold, because he starts his adventure in this game. So it should have been someone else, besides Lance.
By the way, I created an article for this hack at the Pokehacks wiki (which is kinda new). Check it out.
http://pokehacks.wikia.com/wiki/Pok%...Christmas_Hack
Cya