This is the my idea for what I would like to see in the Pokémon Brilliant Diamond and Shining Pearl Pokédex based on the one from Pokémon Platinum.
The changes I made are

  • I added Mr. Rime and Sylveon since they are evolutions of existing Pokémon in this Pokédex. These are similar to the addition of Gallade in Omega Ruby and Alpha Sapphire.
  • I added Stantler since it is getting an evolution, Wyrdeer, in Pokemon Legends: Arceus.
  • I moved the Gible line to directly before the legendary Pokémon to be closer to how the other Pokédexes list the pseudo-legendary Pokémon before the legendary Pokémon.
  • I added the legendary Pokémon that weren’t in the Pokédex to it and moved all the legendary Pokémon together at the end.
  • I moved Darkrai out of the mythicals section to be next its counter part Cresselia.
  • I moved Phione after Manaphy since it should be a mythical given that you need to breed Manaphy to get it.

Turtwig Grotle Torterra Chimchar Monferno Infernape Piplup Prinplup Empoleon Starly Staravia Staraptor Bidoof Bibarel Kricketot Kricketune Shinx Luxio Luxray Abra Kadabra Alakazam Magikarp Gyarados Budew Roselia Roserade Zubat Golbat Crobat Geodude Graveler Golem Onix Steelix Cranidos Rampardos Shieldon Bastiodon Machop Machoke Machamp Psyduck Golduck Burmy Wormadam Mothim Wurmple Silcoon Beautifly Cascoon Dustox Combee Vespiquen Pachirisu Buizel Floatzel Cherubi Cherrim Shellos Gastrodon Heracross Aipom Ambipom Drifloon Drifblim Buneary Lopunny Gastly Haunter Gengar Misdreavus Mismagius Murkrow Honchkrow Glameow Purugly Goldeen Seaking Barboach Whiscash Chingling Chimecho Stunky Skuntank Meditite Medicham Bronzor Bronzong Ponyta Rapidash Bonsly Sudowoodo Mime Jr. Mr. Mime Mr. Rime Happiny Chansey Blissey Cleffa Clefairy Clefable Chatot Pichu Pikachu Raichu Hoothoot Noctowl Spiritomb Munchlax Snorlax Unown Riolu Lucario Wooper Quagsire Wingull Pelipper Girafarig Stantler Hippopotas Hippowdon Azurill Marill Azumarill Skorupi Drapion Croagunk Toxicroak Carnivine Remoraid Octillery Finneon Lumineon Tentacool Tentacruel Feebas Milotic Mantyke Mantine Snover Abomasnow Sneasel Weavile Rotom Gligar Gliscor Nosepass Probopass Ralts Kirlia Gardevoir Gallade Lickitung Lickilicky Eevee Vaporeon Jolteon Flareon Espeon Umbreon Leafeon Glaceon Sylveon Swablu Altaria Togepi Togetic Togekiss Houndour Houndoom Magnemite Magneton Magnezone Tangela Tangrowth Yanma Yanmega Tropius Rhyhorn Rhydon Rhyperior Duskull Dusclops Dusknoir Porygon Porygon2 Porygon-Z Scyther Scizor Elekid Electabuzz Electivire Magby Magmar Magmortar Swinub Piloswine Mamoswine Snorunt Glalie Froslass Absol Gible Gabite Garchomp Heatran Regigigas Cresselia Darkrai Uxie Mesprit Azelf Dialga Palkia Giratina Manaphy Phione Shaymin Arceus