: Features like infinite TMs, Nature Mints, Ability Capsules, and removal of trade-based evolutions are common. : Advanced hacks like Heart & Soul
: Use an online tool like Rom Patcher JS to apply the hack to your base ROM. pokemon heart gold gba rom
These are ROM hacks built on the Pokémon FireRed or Ruby engine. They painstakingly recreate the Johto region, the story of HeartGold, the Pokémon following system (a hallmark of HGSS), and even the Pokéathlon using GBA graphics and sound. : Features like infinite TMs, Nature Mints, Ability
One of the oldest and most famous Johto GBA hacks. : Features like infinite TMs
These are fan-made demakes. Talented modders have spent years rebuilding the Johto region inside the GBA engine. Popular examples include: