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Alright, here's two IPS patches for Pokemon Red and Blue. Make sure the versions you use to patch say "(UE) [!]". Both versions include Popplio and Brionne.
anonfiles()com/a0C4C8T3yf/pokebrionne_zip
I also poorly attempted to recreate their cries using the gen 1 sound format. You can obtain Popplio from the Mt Moon Pokemon Center via the Magikarp Salesman.
Also I added genders to the game, but they're only viewable in the status screen. Couldn't figure out how to get them to work in battle. I also took this from Shin Pokemon Red but you can hold start to view DVs and hold select to view stat Exp when selecting your pokemon.
Anyways, have fun Brionne lovers. I know I had a lot of fun making it.