don't know where the hell to find it but i have a freaky feeling it's on the third floor on the velstone department store (just a freaky feeling i don't even know if it's there.
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You find the sludge bomb, team rocket HQ on island 5.
Route 43 after you beat the Team Rocket in Mahogany Town
in the warehouse at veilstone good luck trainers.
we find it in goldenroad city . before beating the team rocket
The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.