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Pushing a boulder into the water.
The boulder push glitch is a natural glitch in Japanese versions of Pokémon HeartGold and SoulSilver and a glitch that is available by Tweaking above Saffron City in non-Japanese versions.
When the player navigates to an area with a boulder and water on the map, the player may move the boulder into the water via Strength, and move the boulder about freely.
This glitch does exist in the translated versions of Pokémon HeartGold and SoulSilver, although not in Slowpoke Well, as the rock was removed by the game developers.
- A video of the boulder push glitch and other Tweaking related glitches on Pokémon HeartGold and SoulSilver by Zowayixx.