to begin creating your application! (You can also make your own template if you want or decorate the current template providing all the things you need to fill out are included.)
You can have ANY pokémon but no duplicates. You can have pokémon from the same evolution line on your team but you can't evolve pokémon into pokémon that you already have; for example: if you have a magikarp and a gyrados on your team then you cannot evolve the magikarp because then you would have two gyrados. This brings me onto my next point.
You can evolve your pokémon. (Unless there are conditions as I have above stated.) You can start with a fully evolved pokémon as well. If you want to evolve your pokémon then you have to have used it in at least one contest before evolving it. Upon evolution you will need to update your application (perhaps include a side-note stating that the pokémon has evolved?).
Shinies are allowed, have as many as you want.
You can have a few custom markings on your pokémon but please don't go over the top. Please no accessories of any kind because you will be adding these in the dress up contests.
If you have any questions then please comment!