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How to Complete Sinnoh Pokedex in "Brilliant Diamond" and "Shining Pearl"

Kain writes video game articles that include tips, tricks, and tutorials. He is especially enthusiastic about horror games.

Completing the Sinnoh Pokédex in Brilliant Diamond and Shining Pearl is not too difficult. It's important to understand that it's not necessary to capture all 150 Pokémon in Sinnoh. You simply need to encounter all the Pokémon in the wild or in battles with trainers. Most of the Sinnoh Pokédex will fill out by itself as long as you don't skip any trainer battles or areas where wild Pokémon appear. There are a few Pokémon that are much more elusive in Brilliant Diamond and Shining Pearl, though.

What Pokémon Do I need?

If you're unsure of what Pokémon you need, bring up the menu and check the Pokédex tab. It will tell you what Pokémon you've seen and which ones you actually caught in a Poké Ball. Look for the number at the top. Detailed information will be unavailable for Pokémon that you have not yet captured. However, there will be a photo of the Pokémon if you've at least encountered it. If you have not seen or caught it, a question mark will appear. Scroll down the list to see which ones you need. Look up the number on the internet to find out which Pokémon you're missing.

It's much easier to fill out the Pokédex after you've defeated the Elite Four and the champion named Cynthia. Make sure not to miss any trainers inside the cave on Victory Road as they have evolved Pokémon that are rare.

The National Dex can be unlocked by completing the Sinnoh Pokédex. It will unlock a massive amount of Pokémon in the Grand Underground! Significantly more of them will appear from the regions of Kanto, Johto, and Hoenn.

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Riolu Egg From Iron Island

The Iron island is actually an optional area that some players may miss. It's essentially a small side quest. You'll need to go there to obtain an egg that hatches into Riolu, the pre-evolved form of Lucario.

In order to access Iron Island, go to Canalave City in Sinnoh. Travel to the docks where you'll find a sailor next to a boat. Speak to him to travel to Iron Island. Eventually you'll encounter a character named Riley. After defeating the nefarious Team Galactic with Riley, he'll give you the Riolu egg.

Happiny Egg From Hearthome City

A hiker in Hearthome City gives you an egg if you speak to him. He is located at the bottom near the entrance to Route 209. You can't miss him! The egg will hatch into the Pokémon known as Happiny. It evolves into Chansey if it levels up during the day while holding an Oval Stone. Chansey evolves into Blissey with high friendship.

All the eggs must hatch for the Pokemon to be added to the Sinnoh Pokedex. Ride the bike to make time pass faster. Eggs hatch faster if you carry a Pokémon like Ponyta or Magcargo with the Flame Body ability. Flame Body cuts the number of steps required in half to hatch eggs.

Boat to Iron Island

Boat to Iron Island

How to Get Drifloon in "Brilliant Diamond" and "Shining Pearl"

Drifloon is a Pokémon that many players could be missing from their Sinnoh Pokedex. There are three different ways to acquire Drifloon's entry. You can either trade for it or encounter one at the Hearthome Gym. One of the trainers at the Hearthome Gym has a Drifloon. It's easy to skip the trainers by answering all the math questions correctly and going straight to the Gym Leader named Fantina. Answer the math questions incorrectly on purpose and challenge all the trainers to find the Drifloon.

Valley Windworks

Drifloon appears on Fridays in front of the Valley Windworks. Run east of Floaroma Town and pass through Route 205. While you don't need to capture Drifloon, it's not difficult to capture it. Drifloon will evolve into Drifblim at level 28.

Valley Windworks

Valley Windworks

The Unknown Pokémon

A Pokémon that is very easy to miss in Brilliant Diamond and Shining Pearl is Unknown. They are diminutive Pokémon that appear in the shape of letters. They are not very useful in battles.

Go to Solaceon Town and run east. You'll encounter an area with a bunch of ledges that you can jump off. Jump down the ones on the far right side until you encounter a cave. The Unknowns are inside the Solaceon Cave. While there are many forms of Unknown, only one needs to be registered to the Pokédex. There are 28 Unknowns in total.

Explore the caves where the Unknown are. Invisible items are next to some of the rocks in the small chambers. There will be trainers that want to battle as well.

Missing Water Pokemon

You might be missing Wooper, Magikarp, Tentacool, Finneon, and Lumineon. They are all Water-types. Magikarp can be found when fishing with the Old Rod or Good Rod. Wooper is found on Route 212, a completely optional area in Sinnoh. Wooper has a 30% chance to appear in the grass. Tentacool can be found when using Surf in the water. They are easy to find, but believe it or not, it was the only Pokémon I was missing after beating Brilliant Diamond because I frequently used Super Repels when using Surf.

Finneon can be caught using a Good Rod or by encountering a trainer that specializes at Water-types. Use a Good Rod on the bridge by Valley Windworks to find a Finneon.

Lumineon in both Brilliant Diamond and Shining Pearl can easily be missed if you skip battling the trainer in the water above Sunyshore City. Speak to Jasmine after obtaining all eight badges to gain access to the area north of Sunyshore City. There will be a female NPC in a bikini who is swimming. Battle her because she has a Lumineon.

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Grand Underground Pokemon in "Brilliant Diamond" and "Shining Pearl"

Make sure to explore the Grand Underground in the Sinnoh Region. There are a few slightly less common Pokémon that you'll need for the Pokédex. You could be missing Munchlax, Aipom, or Combee. Heracross can be encountered from a Honey Bee tree, albeit, I think a trainer may have him as well.

Pokémon reappear in the Grand Underground when you leave the large rooms and reenter them. Keep doing that until the Pokémon you want spawn. Make sure to explore other areas of the Grand Underground, as all Pokémon have different encounter rates. Using Statues in your Secret Room can attract a specific type of Pokémon. Statues can be found by digging for treasure by using the pickax and sledgehammer.

Cleffa in Mount Coronet

It's entirely possible to miss Cleffa, the pre-evolved form of Clefairy. Travel to Oreburgh City and go to Route 207 until you reach the cave entrance to Mount Coronet. Cleffa have a higher encounter rate in the morning. Run around the cave until it appears.

Dialga and Palkia

Dialga is exclusive to the Brilliant Diamond and Palkia is exclusive to Shining Pearl. Trading is not necessary to acquire the other Legendary. All you have to do is visit Cynthia's Grandmother in Celestic Town. Go to her house in the back and speak to her. She will show you a photograph of the other Legendary that you did not encounter at Mount Coronet.

Mesprit and Lake Guardians

The Lake Guardians are Mesprit, Azelf, and Uxie. All three must be encountered to add them to your Sinnoh Pokédex. Go to Verity Lakefront to encounter the Mesprit in the cave. After the cut-scene, Mesprit will roam around in Sinnoh, but you don't need to face it in battle unless you want to catch him.

Azelf and Uxie are at the Valor and Acuity Lakefronts respectively. Use the HM surf to reach them in the caves. Catching them is optional. I'd recommend paralyzing and weakening them before trying to throw an Ultra Ball or a Dusk Ball.

Cynthia's Grandmother in Celestic Town

Cynthia's Grandmother in Celestic Town

Grand Underground

Grand Underground

National Dex in "Brilliant Diamond" and "Shining Pearl"

Once you've found all the Pokémon that are native to the Sinnoh Region, return to Sandgem town. Speak to Professor Rowan to trigger a cut-scene. Professor Oak enters and eventually gives you the National Dex.

The National Dex will now allow you to capture over two hundred more Pokémon in Brilliant Diamond and Shining Pearl. Most of them will appear in the Grand Underground. You'll also have the opportunity to catch over a dozen Legendary Pokémon like Mewtwo at Ramana's Park!

It can be very time-consuming to catch or encounter all the Pokémon in the National Dex. Many of them will have to evolve a couple levels to reach their final evolution. Others will need to evolve through high friendship or by giving them Evolution Stones.

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© 2021 David Patrick