GameShark Codes to Reach the Moon in Pokémon Ruby/Sapphire: Don't Exist

No such codes exist. The moon is not a programmed location in Ruby/Sapphire—GameShark cannot create content that isn't in the ROM.

Attempting "moon codes" typically results in:

• Black screens / crashes.
• Corrupted save files (loss of all progress).
• Glitched graphics / infinite loops.

What Is Possible

• Walk through walls to see unused map edges.
• Encounter any Pokémon via wild modifier codes.
• Warp to existing maps (Space Center, Sky Pillar, etc.).

Enjoy Hoenn as designed—there's plenty to discover without risking your save.