If you are looking for other ways to experience Johto on the GBA with modern mechanics, these updated titles are trending: Pokémon Heart Ash (NDS/GBA)
Many versions of the hack remove the need for HM moves to progress, streamlining exploration. Version & Translation Details
: Catch and train the specific Pokémon Ash used in the show, including the three Kanto starters given at the start when you encounter Suicune.
: Features include Generation 6's Exp. Share system, reusable TMs, and moves updated from the first through sixth generations.
: It features a revamped Johto region with events involving characters like , recurring battles with Team Rocket
: A high-fidelity remake of Johto for GBA that includes Pokémon following the player and custom shiny rates. GS Chronicles