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The Queen
I also found this episode to be sort of like a hinge for which episodes later could hook onto and propel CS further. When the episode first aired, I had expected the relationship to go further in the Hoenn GF, but alas, it seemed to be up a tick, but stable. The only thing that really changed was that Drew started sticking his nose into May's affairs a little more. He starts off as an atagonist, for the most part, in most/all of the episodes (to May's face, anyway) before the Wynaut Ep, and then after it, he becomes a sort of support, even though May doesn't realize it until very late in the game (and it is adorable in Unbeatable Lightness when she calls after him, THANKING HIM for this).Tiffany said:10...years. Almost. Oh my gosh. Well, I feel like the Wynaut episode was crucial to showing us their development. It showed May and Drew's relationship and how they weren't only rivals, but more than that. They were now friends, at least, and who can deny those softened glances Drew gave May when she was playing with the Wynaut? They started to see each other in a different light, and my feelings about this episode haven't changed one bit. :]
I also find that, after the Wynaut Ep, the two become much more aware of each other and get involved with each other's business more often. Like I said before, prior to the Wynaut Episode, May and Drew do their own thing, meeting each other for brief instances or doing shippy things from afar (Drew in the Phantom episode, for instance). Then after it, Drew snoops around and obviously doesn't trust Harley (enough to butt in and warn May that what Harley was saying was complete crap), and May joins Drew in the hunt for Arcanine (even though this isn't shippy, it's still in Drew's personal space). We don't see this personal mingling very much before the Wynaut ep, except for maybe in the Rubello Contest when May catches Drew training Masquerain (and then he catches her spying).
But anyway, about the episode itself. It's a trophy stash of canon hints on Drew's side. But I think it's #1 function was to soften May's outlook on Drew. Up until this point, like I keep repeating, he's just a rival or antagonist to her goals. With Harley's introduction and this episode, this one-dimensional view of him breaks down, not only for May, but also for the viewer.
They are extremely cute together throughout the whole thing - with Drew constantly directing his conversation and attention to May, even while Roderick is there, and May, again, shows openess towards Drew. She really does not (and never did) harbor any real bad feelings towards him, but I still wouldn't consider them friends. I always felt that was a huge cover-up by May, or just something she said because she really doesn't know what to call Drew yet. I find it really astounding how Drew kept himself mysterious and antagonizing enough to remain a not-really-friend and still managed, from what I saw, to win over the girl. Either that was a happy accident, or it was calculated genius. IDK.