If you are looking to create or edit a player to be the absolute best version of themselves, follow this workflow:

To determine the best player editor for PES 2021, we evaluated tools based on:

Recommendation: If you are a stats enthusiast or a deep tactician, this is likely the best player editor for PES 2021 for you.

: Widely considered the best external tool for detailed database management. It allows users to quickly edit player values, including stats, appearance, and positions, across the entire database. PES 2021 In-Game Editor

The Smoke Patch team built a custom tool specifically for their famous Super Patch, but it works as a standalone editor. This tool focuses heavily on rather than save-file editing.