Pokemon Diamond and Pearl 2

Core Concepts

 * Will use some concepts from this article as well as Temporal Diamond and Spatial Pearl.
 * Essentially the Black 2 and White 2 to Platinum's Black and White, in that it takes place after Platinum but is split into two versions.

Region Changes

 * Fuego Ironworks has been expanded into Fuego City.
 * A new town exists south of Mt. Coronet, where the player starts.
 * Another town exists on the way to Snowpoint.

Pokedex Expansion
Total of 150 new Pokemon for a total of 360.
 * Alolan Rattata and Raticate.
 * Ekans and Arbok.
 * Alolan Sandshrew and Sandslash.
 * Vulpix and Ninetales.
 * Oddish's evolutionary lines.
 * Alolan Diglett and Dugtrio.
 * Poliwag's evolutionary lines.
 * Farfetch'd.
 * Alolan Grimer and Muk.
 * Voltorb and Electrode.
 * Cubone and Alolan Marowak.
 * Tyrogue's evolutionary lines.
 * Pinsir.
 * Ditto.
 * Dratini, Dragonair, and Dragonite.
 * Mareep, Flaaffy, and Ampharos.
 * Shuckle.
 * Teddiursa and Ursaring.
 * Slugma and Magcargo.
 * Skarmory.
 * Smeargle.
 * Lotad, Lombre, and Ludicolo.
 * Surskit and Masquerain.
 * Breloom.
 * Sableye.
 * Aron, Lairon, and Aggron.
 * Carvanha and Sharpedo.
 * Numel and Camerupt.
 * Trapinch, Vibrava, and Flygon.
 * Lunatone and Solrock.
 * Castform.
 * Bagon, Shelgon, and Salamence.
 * Beldum, Metang, and Metagross.
 * Heatran.
 * Regigigas.
 * Cresselia.
 * Phione.
 * Darkrai.
 * Shaymin.
 * Arceus.
 * The elemental monkeys.
 * Muuna and Musharna.
 * Pidove, Tranquill, and Unfezant.
 * Drillbur and Excadrill.
 * Venipede, Whirlipede, and Scolipede.
 * Darumaka and Darmanitan.
 * Scraggy and Scrafty.
 * Yamask and Cofagrigus.
 * Trubbish and Garbodor.
 * Vanillite, Vanillish, and Vanilluxe.
 * Deerling and Sawsbuck.
 * Klink, Klang, and Klinklang.
 * Litwick, Lampent, and Chandelure.
 * Axew, Fraxure, and Haxorus.
 * Cubchoo and Beartic.
 * Pawniard and Bisharp.
 * Rufflet and Braviary.
 * Larvesta and Volcarona.
 * Fletchling, Fletchinder, and Talonflame.
 * Spritzee and Aromatisse.
 * Swirlix and Slurpuff.
 * Tyrunt and Tyrantrum.
 * Amaura and Aurorus.
 * Sylveon.
 * Phantump and Trevenant.
 * Yungoos and Gumshoos.
 * Oricorio
 * Mareanie and Toxapex.
 * Salandit and Salazzle.
 * Palossand.
 * Type: Null and Silvally.
 * Minior.
 * Turtonator.
 * Mimikyu.