Just a random idea. Maybe the Box challenge or something. In the challenge, a person takes a game in which they have completed ( basically beat E4 two times or beat Red in some cases) and posts how many boxes full of pokemon they have. The next poster posts a random box number which the poster above had, and then the poster chooses 6 random pokemon from that box,( maybe by a diagnal order,first from each row, etc.) and those 6 pokemon ( or 4 or5 if they want an HM Slave) are used in his/her journey. Also, they start a different game, pokemon may be traded if not found in that game. Maybe something along those lines.