Let’s address the elephant in the room: ROM legality. Downloading a copyrighted ROM from a random website is in most jurisdictions. However, there is a legal pathway.

The is the "Gold Standard" for creators. Because technical offsets for data like maps and Pokémon stats differ between versions, most legendary ROM hacks are built specifically for V1.0. what is the difference between just the normal and a rev 1?

which can manipulate game memory to produce unexpected effects. Emulation & Saves: Some modern platforms, like the Nintendo Switch

| Feature | Leaf Green V1.0 | Leaf Green V1.1 | European (V1.2) | | :--- | :--- | :--- | :--- | | E-Reader Code | Present (dormant) | Removed | Removed | | Gym Leader AI | Original, exploitable | Tweaked, smarter | Same as V1.1 | | Berry Crush Timing | Lenient | Strict | Strict | | Language | English | English | 5 European languages | | In-game Glitches | Several (e.g., Pomeg glitch variant) | Fewer | Fewest | | ROM Hacking Support | Excellent | Poor | Poor |

v1.0 is often preferred for executing older exploits, such as the mail glitch