So, you’ve finished the game and received theNational Pokédex. Congrats! You’re finally eligible to meet the legendaries located outside of Sinnoh (as long as they’re a part of the first three generations). You can meet most, like the Regis and Mewtwo, in Ramanas Park along Route 221. However, you need to exchangeMysterious Shardsfor Slates in order to summon them. These can only be mined for in the Grand Underground—and they’re very rare.

Fortunately, there’s an efficient way to mine for these gems. To get Mysterious Shards fast in Pokémon Brilliant Diamond and Shining Pearl,wait until yourDiglettgauge is at 40/40 before you dig. Because once it does, rarity rates increase forfour minutes, boosting your chances of finding Mysterious Shards until the gauge resets to zero.

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Reaching 40/40 is much easier when you go into the Underground connected to the Internet. This is becauseevery trainer in an Underground room share the same Diglett gauge. Every Diglett sparkle they pick up gets added to yours, and vice versa.

Related:All Grand Underground Pokémon in Brilliant Diamond and Shining Pearl

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Of course, it’s important to remember that not everybody is eager to fill the gauge, so be patient. If possible, play with friends who are also hunting for Mysterious Shards, so you’re sure that everybody is working to fill the gauge together.

For more help withPokémonBrilliant Diamond and Shining Pearl, we at Pro Game Guides have you covered.