Pokémon Ruby and Sapphire/Seafloor Cavern — StrategyWiki

Seafloor Cavern is a subterranean cave deep beneath the waves of Route 128. The cavern is somewhat maze-like, and constantly requires the use of Rock Smash and Strength

Pokémon Ruby and Sapphire/Seafloor Cavern — StrategyWiki

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Seafloor Cavern - Pokemon Omega Ruby and Alpha Sapphire Guide - IGN

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Pokémon Ruby and Sapphire/Route 124 — StrategyWiki

Pokéarth - Hoenn - Seafloor Cavern

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Seafloor Cavern - Pokemon Omega Ruby and Alpha Sapphire Guide - IGN