PokéBase - Pokémon Q&A
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The Sludge Bomb TM is in the rocket warehouse yes, but it's behind a convoluted floor puzzle where you need to take specific spinner tiles to reach the TM.

This guide has a step-by-step tutorial on how to reach the TM.

But I'll also add a screenshot of the TM's exact location here, taken from the tutorial page:

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It can be found at the Rocket Warehouse.
Hope I helped! :)
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