Are you speaking of how to do it? (I don't know spanish language)
You can look at this thread:
Research: NDS-Style Pre-Battle Mugshots - The PokéCommunity Forums
As jambo51 has done the routines(tobehonest, when i do the hack i didn't know ASM yet so i can tell you nothing about the ASM codes because i haven't analyzed them yet), the author of this thread build a new table for mugshots ('obj's),then a person called DERLO made a lot of replies to the thread and i was just gathering the information they gave out together. I don't remember much things because i do it long ago, but i still remember that DERLO gave out the offset of the tileset and tilemap of the background, which can be edited by a hex editor and a tile editor like crystal tile 2 or tile molester. If i remember correctly, The data are all not lz77-compressed so you can edit them directly.
Hope the information can help you!