I did not create this map. I was given permission to translate, remix, and share this map by Zelda368 aka Anybody. The link to their original map is below:

https://minecraft.fr/forum/threads/map-aventure-avec-pixelmon-1-12-2-pixelmon-diamant.261777/

This map follows the main story of Pokemon Diamond but also has parts from Pearl, Platinum as well as Brilliant Diamond and Sparkling Pearl. I added a dynamic rival as well as additional story to the Team Galactic quest via trainer commands. Both are optional but have seperate rewards for completing them. One major feature I added was music by using the same logic as Jond. You need to manually change music depending on areas, biking, trainers, and pokemon. Dual slot pokemon spawns were added to routes for more encounters in main game. The postgame also now includes capturing 270(30% of the pokedex) pokemon via the pixeldex mod with rewards for completing every 10% of the pokedex. The battle tower now has more trainers to fight and has its own reward for completing it.This map is what helped me learn about map making. If you run into any issues with controls, check the control settings and map the controls to the prefered buttons to prevent potential overlaps.

Features:

Accurate spawns/items with Dual Slot spawns added for additional variety
Complete 30% of pokedex for rewards via pixeldex
Fight a dynamic rival
Beat gyms and collect gym badges
Optional Team Galactic Quest
Defeat Elite 4 and Champion with the option to remtach them at a higher level
A Post game
Dynamic music with the use of mcfunction files and command blocks

I used Prism launcher to test this map so I'd reccomend using it to import the modpack.

I got the character skins pack from this renegade platinum adventure map and then modified it by adding aditional character sheets(the modified character skin pack is already included in the download):

https://www.planetminecraft.com/project/pixelmon-sinnoh-map-renegade-platinum/

Additional mods needed:

BOP-Patch-1.0.jar

https://pixelmonmod.com/mirror/sidemods/boppatch/1.0/

CustomNPCs_1.12.2-(05Jul20).jar

https://www.curseforge.com/minecraft/mc-mods/custom-npcs/files/2996912

Extreme optimization-fixed-0.1.0.zip

https://www.curseforge.com/minecraft/modpacks/extreme-optimization/files/4354950

PixelExtras-1.12.2-2.5.17-universal.jar

https://pixelmonmod.com/mirror/sidemods/PixelmonExtras/00/

Pixelmon-1.12.2-8.4.2-universal.jar

https://www.curseforge.com/minecraft/mc-mods/pixelmon/files/3794035