First things i'd like to say guy's is the difference between pasta and fanfic.
Pokemon Creepypasta is when its in the real world, E.g. if you go and find a game and it goes all creepy and messed up showing you pictures of dead people.
Pokemon Fanfic is when its in the pokemon world, E.g. if your a pokemon trainer and your best friend eats your first pokemon.
Pokemon Theories are when your making a statement of something that could be true, E.g. That cubone was supose to evolve into kangaskan and that missigno was put in there to replace the gap.

EDIT: this isn't a universal thing, it was so people would stop sending their work to the wrong sections.

Also, just a little question.
How would you guys feel about competitions? woulc you guys participate if we did some?