Local pokemon movepool legality freak here reporting in. Wanted to pop in here as an old Wi-Fi mod who's moderated legality on the forums and was also just around in the Little Cup Forums community for some of the talk about Pomeg Glitch's original initial use cases for LC.
(Disclaimer: I have no horse in the race for what rule sets are influenced by a potential change. I think the communities should roll with makes them the happiest)
I do not feel changing the legality of the Pomeg Glitch is nessisary. However, I believe that verbiage should be added to what exactly the Pomeg Glitch entails for competitive Pokémon's usage and what it does not. The glitch has taken on another life since its initial discovery as a completely game-breaking tool for arbitrary code execution-adjacent purposes, far beyond its modest original intended competitive use. If it is being preserved, we should specify these limitations.
As already stated, the glitch in its original form was a way to obtain Pokemon and moves at lower levels than what is normally allowed. This is really important for genderless and male only Pokemon (
and a few irrelevant moves on female only too!) from Gen 3, as well as anything that comes from an event. This is most important for some Pokémon like Porygon and Extremespeed Zigzagoon that otherwise don't learn their later evolution attacks in Gens 3-6. This is the glitch in the state it's been used for competitive Pokémon's sake and for Pokemon Showdown's movepool legality checks (at least the last time I looked at the code... admittedly back in 2016).
The opening of this video is a good demonstration of the glitch as it was traditionally understood, allowing a Pokemon in an egg to battle and tediously level up so that it can gain moves / evolutions before properly hatching:
The scale of what the video in the bug report is doing involves far more complex set up under a sub glitch, apparently sometimes referred to as "glitzerpopping", involving using this initial pokemon to generate a glitched empty pokedex entry ? pokemon, and then do wild stuff with index numbers to lead to arbitrary code execution.
This is the video the Shiny Celebi report video is using as a reference for the set up to show how wildly different it is from what the glitch has been used for movepool legality's sake:
What is being displayed in this shiny celebi video might have the Pomeg glitch as its entry point, but its using it as a door to far more absurd shenanigans that we traditionally do not allow. This is more akin to the ridiculous coin case shenanigans you can get up to generating Pokemon in GSC or BDSP's menu storage Pokemon overwriting. Allowing this domain of the Pomeg Glitch effectively allows any arbitrary combination of Pokemon or moveset on any Pokemon with the right set up.
To prevent this larger implementation, but preserve the traditional gameplay for LC, I would like to propose that for Smogon's implementation of the Pomeg Glitch, if kept, we limit it to something like:
Pomeg Glitch Clause: The Pomeg Glitch is allowed for the sake of allowing an otherwise legal Pokemon to gain moves and evolutions it would otherwise not have access to at an earlier level. The wider implications of the Pomeg Glitch for arbitrary code execution are banned.
I think this solution would keep Gen 3-6 little cup players happy with their rule set preserved while not opening pandora's box to its full blown absurdity.
On the whole, the Pomeg glitch being allowed is an anomaly, absolutely. I can't recall a single other instance of us explicitly allowing a glitch like this (unless it's something painful to implement like perfect IVs in RBY). It is a weird artifact of its time that we're still playing with it, but I guess we also play with other weird features the community likes like Rotom-A in DPP.
