'New' RBY Competitive Mechanics?

I read somewhere that some battling mechanics from the series' first titles Red, Blue and Yellow werestillbeing discovered, with one very meta changing one found just last year. My question is this: what was this mechanic, and what other mechanics were only found after the release of the second generation?

Pleaselog inorregisterto add a comment.

Only a few months ago, Crystal_ made some startling revelations about the mechanics of the first generation. These previously unnoticed mechanics are incredibly significant, changing the way the game has been played since the beginning of competitive Pokémon! This article, written a few months after these initial discoveries, tries to understand how the metagame has changed. The most important mechanical change is that Body Slam cannot paralyze Normal-types. This is part of a general rule that a move’s added effect does not affect Pokémon of the same type. For example, Blizzard can’t freeze Ice-types. This goes for every status except poison. There are two other slightly less major discoveries; one is too complex for me to explain here, but it’s detailed in the link at the bottom** — all you need to know in the context of this article is that it is effectively a buff to Slowbro. The other discovery is that we now fully understand Counter’s mechanics. The way it works is that it deals back double the amount of damage currently stored on the damage address, as long as the foe’s last move was a Normal- or Fighting-type attack other than Counter. Note that when your foe spends turns asleep, switching, frozen, or fully paralyzed, the damage address does not reset. It will reset successfully when any move that is not a Normal- or Fighting-type attack is used.

sourcethe other discovery, which is kind of complex

http://bulbapedia.bulbagarden.net/wiki/List_of_glitches_in_Generation_I#Red_and_Blue

That link should prove sufficient.