Greetings. I decided to start another TAS for this category from scratch a couple of weeks ago, trying to make more optimizations and looking for more timesaves.
I ended up saving 2005 frames (33.514 seconds) so I wonder if that can be changed. Here's the movie file: https://tasvideos.org/UserFiles/Info/638647795283292125
Here's my encode, now with subtitles with commentary.
https://www.youtube.com/watch?v=xIs26boaXAA
Right now there are no plans, but it's not far of being considered. I'd gladly do it when I get in the mood.
My first TAS being three and a half hours long is kind of exhausting, to say something, haha.
Voltorb Flip is the reason I don't go shopping at the Goldenrod Department Store as soon as I get there on my first trip, I need Dratini for the Double Battle at Route 37 because the Clefable and Wigglytuff are all Level 16 and they don't have that much HP, so Dragon Rage is really strong in this context, and I doubt Sentret (and even worse, Abra) will help me with that fight. Catching Wild Pokémon is also slower, so I can't just look for both of those Pokémon just like that, the only Pokémon I catch as a Wild Encounter is Raikou, and I can't lose any "tiles" on my way to manipulate Raikou's stats when I get to Burned Tower B1F, or else the TAS just doesn't work.
Because this is glitchless, Thunderbolt has more value because it has better accuracy and more PP, which you are already supposed to manage carefully in the first place since this is a longer TAS, and I also can't detour to pick some PP Ups. Thunder has more value in any% (which I don't know if I will make a TAS of) because you'll face some of the thougher trainers, including Red, at a much lower level and you have to RNG Manip to hit it every single time.
Gyarados has other problems, too. First, you can get a level 50 Magikarp at Route 43 via Surfing, which is very late into an RTA run (the Johto section, at least), so you would have to do Whitney and Morty with Quilava and/or Kenya, and evolving the latter is slow. I use Raikou so I can take on Chuck, so I can unlock the ability to Fly to previous locations, which will let me go back to Olivine City after I defeat Pryce, so I can cure Amphy to finally challenge Jasmine. Speaking of her, Steelix's resistance to Shadow Ball (in Gen 4) let's me 2HKO it without forcing Steelix to eat the Sitrus Berry it is holding, because that takes time. In this context, dealing a super-effective Water-type attack is no different because it will get me the additional text anyway, and although I haven't done the damage calculation, if Steelix doesn't die and it is below half HP, it will eat the Sitrus Berry that I'm trying to avoid. TLDR Raikou is faster because it allows me to backtrack faster.
Getting Discharge at level 57 is no problem because there's only one other mandatory Double Battle at Route 25, which is in Kanto.
If Gyarados is slower, Waterfall's flinch doesn't get much value. Raikou outspeeds everything in the game, including Red's Pikachu by one point, which has a much bigger level advantage.
Maybe if this was 2011 then Gyarados would be the ideal option, but the years have been passing and there's better knowledge for speedrunning this game, and hopefully TASing after having made my own recording.
Voltorb Flip uses Secondary RNG, which is mostly static throughout the run and only advances if certain escenarios are occurring on the overworld, such the rain at Route 33.
Most flips in Voltorb Flip advance the Secondary RNG by 1, but if you choose a panel that has no bomb on either it's row or column, it won't advance at all. I do Voltorb Flip the exact way everytime to get the amount of coins I need in the lowest amount of rounds possible. If I only go for 2s and 3s, I will get different boards.
I tried going with that in my earlier attempts of TASing this game and it ended up being worse.