There was a site that listed Pokemon episodes that removed filler episodes. So if a Pokemon was not caught, evolved, learned a new move or if Ash did not have a gym or an important battle or if no recurring trainer or Pokemon was seen or if it had nothing to do with a story/arc/background then the episode was removed.
--
BOP Results: http://www.freewebs.com/charmander6000/Rivalry%20BOP.xls
Congrats to SuperNiceDog for winning the guru contest.