Based on the original Pokemon Silver Soul version, a hacker ROM with the nickname “brtatu” created an interesting remake called Pokemon Silver Yellow (Pokemon Silver Soul Hack). In the game, you will be playing according to the old story but the experience will be completely new with unique changes.
FEATURES
– Pikachu as a starter with edited move set and status
– Redesign of Kanto’s wild Pokémon
– Squirtle, Charmander and Bulbasaur obtainable through Pokémon Yellow events
– Primal Town and Team Rocket epic event
– God’s Garden as a new area
– Mega Charizard X instead of Y
– National Park with many different Pokémon
– Red as protagonist
– Mew, Deoxys, Jirachi, Suicune, Registeel, Regirock and Regice and much more catchable
– Blue is now at Mt. Silver with a team composed by some of his Pokémon of anime/games/manga
– The Pokémon who need to be traded to evolve can do it reaching level 36 or using the required item
– Wild Pokemon edited
– Trainers’ levels balanced
– Some Pokémon attacks edited (see the “read me”)
– Lucas (Platinum Hero) can be challenged at Victory Road
– Kanto starters (Blastoise, Charizard, and Venusaur) can now mega-evolve
– EV Training Road
About Mega-evolutions
– They are in the game but just for the Kanto starters
– They work as a new evolution and are reversible
– To know how to mega-evolve, defeat Lucas at Victory Road. He will tell you
– The move sets of Mega-Pokémon are similar (not equal) to 6th gen (see Bulbapedia)
– There is not Charizard Y in-game
– The Mega-Pokémon overworld sprites were not edited because in 6th gen they just appear in battles
– They are replaced with Uxie, Azelf, and Mesprit.
More information
https://gbatemp.net/threads/pokemon-silver-yellow.520045/#post-8325655