Gladly. You see, instead of peoples' username, sig, avatar, and usertitle appearing, it would instead be a randomly selected Pokemon each time you were load a page, edit a post, ect. Your username would be, in example, Bulbasaur. Your avatar would be its Fifth Gen animated sprite, your usertitle would be the number the Pokemon is in the Pokedex, for our example, Bulbasaur, that would be #001. Something like that anyway. If you looked around, you could probably find some blogs with screenshots of the event. You could also ask someone else to better explain this if you had any difficulties understanding me. :) (Also, there was a 1/3 chance you would get a shiny Pokemon. o3o)