Pokemon Harmon Y is a 3DS ROM Hack by Ecnoid based on Pokemon Y in English. It was last updated on May 14, 2020.
Also, be sure to check out Pokemon Nova Hoenn.
Pokemon HarmonY is a romhack of Pokémon Y that changes the colors of every single obtainable shiny in the game and increased shiny odds to 1/100 and swaps Team Flare for Team Plasma. Other primary features include BREAK evolution which lets final stage Pokémon permanently evolve into a powerful golden form, the new Harmonic type and Kalosian forms which change not only the color palette of a Pokémon but also their typing, move set, stats, etc. Encounters and trainer teams are also changed, along with various smaller quality-of-life features.
V2.0
V1.4
V1.3
If you find a ROM that's encrypted, you need to use the Batch CIA 3DS Decryptor, created by Matif.
Not all games are fully compatible with Citra. If you do find a game that's not working, try using the latest PabloMK7 Citra fork, the continuation of Citra since its shutdown.
Citra is an open-source 3DS emulator for Windows, Mac, Linux and Android devices.
It is designed to recreate the functionality of the Nintendo 3DS system on other platforms, enabling users to play 3DS games in higher resolutions and with improved graphics.