The Route 124 half rock can be found in Pokémon Emerald. It does not occur in Pokémon Ruby and Sapphire.
West of Mossdeep City and north-east of the shard NPC's house are two water rocks that do not exist in Ruby and Sapphire (the left-most one requires moving further north to be observed via a walk through walls cheat or getting there via a different route).
For unknown reasons, the right-most water rock is missing its bottom section. The rocks are circled on the Emerald pictures below.
Emerald (from the south-west)
Emerald (from the north-east)
- Matt1990's friend (reporting the glitch)
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