Pokemon Ruby and Sapphire: Tate and Liza's Gym Puzzle (Mossdeep City) - YouTube
Pokéarth - Hoenn - Mossdeep City
Mossdeep Gym - Bulbapedia, the community-driven Pokémon encyclopedia
Pokemon Emerald Version Mossdeep City Gym Warps Map Map for Game Boy Advance by Mew_Jadester - GameFAQs
Playing Emerald Advanced. Going to Mossdeep City, There is a kind of invisible wall. I could pass. Solution? Maybe it is an uncompleye hackrom? Thank you! : r/PokemonROMhacks