Soloing Steven with a Swellow. Absolutely mind-boggling. (Screencap is of his skarmory biting the dust...I can only imagine RNG abuse was to get something like HP Fire.)
I've taken a whack at speed-running a couple of times. First time, I had no clue what I was doing and actually did the trick house for the extra levels. Still cleared Emerald in a little under 15 hours. Then I wised up, planned a route to some extent, picked the girl and beat Ruby in 8:32:18.
But I knew I could do better. I knew there was room to improve on running Hoenn (I recommend picking the guy because "Brendan" is a lot longer than "May"), so despite having six silver symbols on the emerald and a personal best 33 win streak on the tower (ONE AWAY FROM ANABEL), I restarted recently and managed a 7:22:38 clear. Overleveling Swampert throughout the game and going out of my way to snag the Return TM for coverage was what enabled me to make the final push past Wallace, though I have to say that Wattson and Norman were gigantic pains in the ass due to being underleveled (though the tate&liza fight went a lot smoother than I expected due to Surf's mechanics in gen 3 having it not hit the user's partner). I also had to take pains to avoid battling aroma ladies. :/
And yes, all of this was on my GBA SP with no externals.
But I got wiped out with no saving grace at all!
And then I'm told I don't have any talent?! Man...