yellow I think I ran into new color palettes ('shiny sprites') in Pokemon Yellow using save editing

[isleep2late]

Hello! I haven't posted here in a while but I thought I'd share something really cool that I discovered while messing around with Pokemon Yellow.

So I'm not sure how many of you know this, but there is a save file editor that actually exists on this website (though it originated elsewhere, you can find the upload by @theSLAYER here, developed by "Ritchie") that can do a lot more than what PKHeX can currently do in the Gen 1 games. This save editor lets you change a Pokemon species without changing the actual sprite of the Pokemon. What that means is that you can have a Gyarados sprite on a Pokemon with Mewtwo stats, and you can even change the typing of the pokemon so that it looks like a Gyarados, but it has Mewtwo stats, while being a Normal/Ghost type.

Well as it turns out, while messing around with this, I discovered that the back sprites of some of these Pokemon look a little different. I first noticed this with Gyarados, but then I tried this on other Pokemon as well (namely Charizard, Blastoise, and Venusaur), and if you play Yellow and have a save file, you can actually replicate this phenomenon yourself.

I couldn't find any documentation about these new sprites on the internet, so I don't know how many people actually know about them. Figured I'd at least share it here (year is 2025 and these games have been around for decades lol) so that someone can actually confirm whether these are in fact undiscovered sprites or if this is a well-known thing.

I'm uploading screenshots of the game so that you can see what I'm talking about. Kinda neat!

-IS2L