Following the four main steps from Pikachu’s guide.
Creating the package
You are now ready to create the skin package! To do this, follow these steps:
1 – Select all of the folders used by the skin in Windows Explorer (Character Select, Configuration, News, etc):
2 – Right click on one of those folders (and make sure that they are all still selected!):
3 – From the “Send To” menu, select “Compressed (zipped) folder”. A new file will be created, with a .zip extension:
4 – Change the name of the file to the name of your skin, and it’s extension to .pmuskn (if your skin is named “Elephants”, change the filename to “Elephants.pmuskn”):
With the new update on 08/07/11[DD/MM/YY], right after renaming your compressed file and changing it to a .pmuskn, your computer will recognise it as a file of the Pokemon Mystery Dungeon MMO, which will be indicated by the PMU icon: