This is a list of all one-time story events, such as choosing your appearance, obtaining the Master Ball, and catching legendaries. Read on for a list of missables, one-time obtainable Pokemon, in-game trades, and what to do before one-time events in Pokemon Brilliant Diamond and Shining Pearl (BDSP).

List of Missables and One-Time Events

Character Permanent Choices

You can't change your name, gender, and skin color after confirming your name and appearance at the start of the game. Clothing styles can be changed, with accompanying hairstyles, but hair and eye color cannot be changed.

Character Creation and Customization

Gifts from NPCs

Pokemon	NPC Location
Happiny (Egg)	Hiker in Hearthome City, beside Route 209 gate
Eevee (Lv. 1)	Bebe in Hearthome City, after obtaining National Dex

The above 2 Pokemon can be obtained from the listed trainers in Hearthome City. They are gifts that can only be received once, but they're not one-time available Pokemon, as you can also catch a Happiny and an Eevee in the Trophy Garden.

Master Ball from Cyrus

You obtain a Master Ball after beating Cyrus at Team Galactic HQ. This event only happens once per save file, to ensure each player obtains 1 Master Ball through story progression. You can, however, repeatedly get Master Balls if one of your Pokemon's IDs fully matches the daily lottery numbers in the Jubilife TV station.

Daily and Weekly Events

One-Time Obtainable Pokemon

Sinnoh Legendaries

In Brilliant Diamond		In Shining Pearl
Dialga		Palkia
In both Brilliant Diamond & Shining Pearl
Azelf	Uxie	Mesprit	Heatran
Regigigas	Giratina	Cresselia	-

Catch Dialga & Palkia during main story

Dialga or Palkia can be caught at the Spear Pillar during the main story of their respective games. Dialga and Palkia can only be obtained in the game that they're the mascot of. If you don't have a copy of both games, you'll need to trade with a player who has a copy of the version you don't.

Version Exclusive Pokemon

Catch Lake Guardians after beating Team Galactic

After beating Team Galactic for good, you'll be able to catch Azelf and Uxie in the caverns of Lake Valor and Lake Acuity, respectively. You can similarly encounter Mesprit in the cavern of Lake Verity, but it will leave the cave and become a roaming Pokemon that you'll subsequently encounter at another random location in the Sinnoh region.

Catch Giratina, Regigigas, Heatran, and Cresselia in post-game

The following Pokemon are only available via a one-time event in the post-game, after beating the Elite Four, becoming Champion, and obtaining the National Dex.

Pokemon	Location
Heatran (Lv. 70)	Inside Stark Mountain (on Route 227 of Battle Zone)
Regigigas (Lv. 70)	5th basement level of Snowpoint Temple in Snowpoint City (Player needs Regirock, Registeel, and Regice in party)
Giratina (Lv. 70)	Turnback Cave (on Sendoff Spring accessed from Spring Path on Route 214)
Cresselia (Lv. 50)	Roaming Pokemon (after encountering it on Fullmoon Island)

Riolu Egg

Pokemon	Acquisition
Riolu (Egg)	Obtain from Riley, after clearing Team Galactic in Iron Island

Part of the main story, Riley will give you a Riolu egg after parterning up with him for Double Battles in Iron Island. This is a one-time event and the only way to obtain a Riolu yourself in the games.

Starter Pokemon

Starter Pokemon
Turtwig	Chimchar	Piplup

You choose your starter Pokemon at Lake Verity at the start of the game, when attacked by 2 wild Starly's. You can only obtain 1 of the 3 Starter Pokemon per save file. Obtaining the other 2 starter Pokemon will require trade.

How to Get All Starters

One-Time Trades with NPCs

NPC's Pokemon	Pokemon to Trade	Location
Abra	Machop	Woman in 1st floor of apartment building left of Poke Mart, on the northwestern side of Oreburgh City
Chatot	Buizel	Boy on 1st floor of Eterna Condiminiums
Haunter	Medicham	Woman in northwestern-most house in Snowpoint City
Magikarp	Finneon	House in the middle of body of water on Route 226

The above in-game trades with NPCs can only be done once and you can't retrade with them to get the Pokemon you traded back. The Pokemon's level will match the level of the Pokemon you give in the trade. The Pokemon each have a set Nature, Ability, and held item, so rerolling doesn't affect them.

What to do Before One-Time Events

Save to Allow Reroll

Saving before an encounter with a Legendary Pokemon or before choosing your starter will allow you to reroll its Nature and IVs (Individual Values). As the Nature and IVs of Pokemon are reset on each encounter, it's possible to reset repeatedly until you have obtained the Nature and IVs of your choosing.

Although checking IVs wasn't available in the original Diamond and Pearl, it's been possible in other Generation VIII games, so it will likely be added in Brilliant Diamond and Shining Pearl.

How to Reset a Pokemon's Nature

Pokemon BDSP Related Guides

Beginner's Tips and Tricks

Brilliant Diamond and Shining Pearl Tips and Tricks