If you want to improve your odds of a critical capture in Pokémon Brilliant Diamond and Pokémon Shining Pearl, you will want to get your hands on the Catching Charm key item.
After first completing the Sinnoh Pokédex, to acquire the Catching Charm you will need to return to the Hotel Grand Lake resort at Valor Lakefront. You can either Fly to Pastoria City or Veilstone City before making your way along Route 213 or Route 214 to reach it.
Once you are at Valor Lakefront, the building that you will need to enter is at the top of the resort. You can see the screenshot below for a quick visual pointer, but, from what we can tell from our own exploration, it’s the only accommodation that has a swimming pool outside of it – if that makes locating it easier.
Inside this building, there is a Gengar-loving Game Director, a Psyduck-obsessed Game Director and a Sound Designer wielding a guitar stood near a bed. You will want to speak to the Gengar-loving Game Director, who, after congratulating you on completing your Sinnoh Pokédex, will reward you with a Catching Charm.
He explains that once you have gotten a Catching Charm, it becomes easier to get a critical catch. Once obtained, it will appear in the Key Items Pocket in your Bag but, at least as far as we can tell, you won’t need to do anything to activate it.
The key item’s description reads: “Holding it is said to increase the chance of getting a critical catch. Curiously, the charm doesn’t shake much.”
Pokémon Brilliant Diamond and Pokémon Shining Pearl are now available exclusively for Nintendo Switch worldwide.