>>43174400It's the other way around, Bulbapedia almost always builds up its knowledge due to the work Smogon contributors do to investigate mechanics for use on sims. The protect question wasn't asked back in 2007 when the item was new, and nobody bothered to go back and ask it for another 13 years.
>>43174448Anyone who wants to see the real sources behind Bulbapedia, Serebii, etc, check out this archive of the DP research thread on Smogon, which includes links to five other threads made to research DP mechanics over a period of a couple years:
https://www.smogon.com/forums/threads/dp-research-thread-6-even-newer.59942/You can even go through the threads yourself and see that nobody ever bothered to ask about the Metronome/Protect interaction, which is why it slipped under the radar for so long.