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dowsing machine maybe
its a poketch app.
that's how you find hidden items
i think there is the dowsing machine app for poketch at the jubilife company
it allows u to find hidden (invisible) items
The purpose of the dowsing machine is to find things. when you hear a beep, your close to a hidden item. when your on the dot, press A to find the hidden item.
In Pokémon Red, Blue and Yellow you can find it in Silph Co and the Pokemon Mansion. In Pokémon Gold, Silver and Cristal you can find it in Kanto at Route 12 and 13. In Pokémon Ruby, Sapphire and Emerald you can find it at Route 119, 123 and 124. In Pokémon FireRed and LeafGreen you can find it in Rocket Hideout, Silph Co, Silph Co and the Pokemon Mansion. In Pokémon Diamond and Pearl you can find it at Route 209, 213 (With Dowsing Machine), 217 (With Dowsing Machine), 228 (With Dowsing Machine), Snowpoint Temple (With Dowsing Machine), Victory Road, Stark Mountain (With Dowsing Machine). In Pokémon Platinum you can find it at Route 209, 211 (With Dowsing Machine), 213 (With Dowsing Machine), 217 (With Dowsing Machine), 228 (With Dowsing Machine), Fuego Ironworks, Veilstone City (With Dowsing Machine), Victory Road, Stark Mountain (With Dowsing Machine). In Pokémon SoulSilver and HeartGold you can find it in Johto in the Union Cave (With Dowsing MCHN), Whirl Islands, Mt. Silver and Dragon's Den and in Kanto at Route 12, 13 (With Dowsing MCHN), Digglets Cave (With Dowsing MCHN). In Pokémon PokéWalker you can find it at the Treehouse (4500+ steps) In Pokémon Black and White you can find it at Route 18 (With Dowsing Machine), Victory Road and Village Bridge. In Pokémon Black 2 and White 2 you can find it at Route 2, 3, Driftveil City, Route 22, 23, Reversal Mountain (With Dowsing Machine), Seaside Cave.
you can find it on ground or using dowsing machine
village bridge trash can use dowsing machine
This was categorized in Pokemon Diamond, Pearl, and Platinum, so here is where you can get Rare Candies in those games. Pokemon Diamond and Pearl: Route 207 (With Dowsing Machine), Route 214, Route 218, Route 223, Route 224 (With Dowsing Machine), Route 225, Route 226 (With Dowsing Machine), Route 228, Route 230, Old Chateau, Wayward Cave, Mt. Coronet, Mt. Coronet (With Dowsing Machine), Solaceon Ruins, Valor Lakefront (With Dowsing Machine), Snowpoint City (With Dowsing Machine), Victory Road, Victory Road (With Dowsing Machine), Victory Road (With Dowsing Machine), Stark Mountain, Veilstone Galactic Building, and Floaroma Meadow. Pokemon Platinum: Route 207 (With Dowsing Machine), Route 210 (With Dowsing Machine), Route 212 (With Dowsing Machine), Route 214, Route 216, Route 218, Route 223, Route 224 (With Dowsing Machine), Route 225, Route 226 (With Dowsing Machine), Route 228, Route 230, Old Chateau, Wayward Cave, Wayward Cave, Mt. Coronet, Mt. Coronet (With Dowsing Machine), Veilstone City, Snowpoint City (With Dowsing Machine), Victory Road, Victory Road (With Dowsing Machine), Victory Road (With Dowsing Machine), Survival Area, Stark Mountain, and Floaroma Meadow.
Use the Dowsing Machine at Mt. Mortar.
There is one in the solocean ruins you can find it by using the dowsing machine or you can find one underground