This is our walkthrough for Mission 18 in Pokemon Legends: Arceus called The Counterpart! Below you’ll find each objective for the mission and how to complete them so expect to find some spoilers.
Head for the place where you can obtain Origin Ore
Follow the objective to Primeval Grotto in the Coronet Highlands. Once inside the grotto, interact with the red shiny crystals on the wall to trigger a cutscene. Afterwards, you’ll battle against Charm with her level 61 Rhydon and level 62 Gengar. Defeat them to continue with the cutscene. When it ends, you’ll receive Origin Ore.
Report back to Professor Laventon with the Origin Ore
Return to Summit Camp and speak with Professor Laventon. After the lengthy cutscene, you’ll receive the Origin Ball!
Prepare well then make for the Temple of Sinnoh once more
Make sure Dialga/Palkia is in your party then approach the front gate to trigger a cutscene with Cogita. When it ends, travel to the Temple of Sinnoh in the Coronet Highlands. Approach the trio to trigger a cutscene then tell them that you’re ready to fight! Defeat the Pokemon by throwing bags at it until its gauge depletes. You’ll then automatically catch it and a cutscene triggers. Congratulations! You beat the game!!
Click here for the next walkthrough on Mission 19 – A New Day Dawns in Pokemon Legends: Arceus!