In this guide, you will come to know how to get the Secret Sinnoh Starters – Piplup, Chimchar & Turtwig in Pokemon Legends: Arceus.
First, you will need to progress in the story to reach the locations where you can capture these starters, so the first one you find while playing in the story is Piplup. You can find it in the Bhasker region on the coastlands map, as shown in the image below.
When you get there, you need to go towards the spring path, and there you will find him by the small pond. They can quickly run away, so you have to hide while catching it not to see you and not run away.
For the Chimchar, you will need to go to the obsidian field lands map, and you will find him on Ramana’s Island. When you get there, you have to head towards the valley, and you can easily spot Chimchar. So now you have to go closer to him carefully and stun him so that he will not run and you can catch him easily.
For the Turtwig, which is a grass ground type pokemon, to find it, you need to go to Crimson Mire Lands inside the drowning meadow, and he will be right next to the pond as well. So you need to sneak in and catch him, as shown in the image below.