One of the oft mentioned responses to deletionism-of-trivia is that a wikia project would be a better place for it. On some level it is, there is the Wookieepedia for Star Wars trivia in such detail that only the most dedicated of fans could appreciate. So theres the solution, all the unnotable Pokemon articles should go into the Pokemon wikia.
There is, however, another level to that argument. Wikia is run by a for-profit Delaware-based corporation. Wikimedia, which runs Wikipedia, is a non-profit charitable organization headed in San Francisco. Why is that relevant? When the question of hosting costs comes up for Wikipedia as they invariably do, advertisement always comes up, and has been shot down so far.
Theory goes, Jimmy Wales who founded both Wikia and Wikimedia would very much like to profit from Wikipedia, but due to the non-profit nature of Wikimedia is unable to as freely as he'd like. So how could you use Wikipedia to generate traffic for Wikia, a private hosting corporation which you own. Also keeping in mind that Wikipedia is by nature rather open about changes, "not-notable, make a Wikia project for it" does come up as a way to drive traffic, life-blood of our current internet age, and a nicely subtle one at that. Anyone looking for something more in depth about a subject than a footnote on a different page goes to the for-profit Wikia and while the text is most likely still free-as-in-speech (GFDL or CC-by-nc-sa), the ads are very much money-generating-as-in-doubleclick.net.
The Wikipedia article for Wikia does note this with cites by staff of both claiming this is inaccurate. However, this is the follow-the-money reason for the deletionism in a medium where new pages cost virtually nothing and anyone interested can get involved.