A Pokemon GO trainer learns that they once traded a Perfect Meltan.
A Meltan with perfect 100% IVs, or individual values—a phenomenally uncommon 4-star Pokemon.
Perfect Dex, which enables players to register every Pokemon with a Perfect Pokemon Appraisal (4 stars).
A fan favourite in Niantic's Pokemon GO, which is still one of the most popular mobile games in the world.
To provide some background, this all revolves on the IV and rating system in Pokemon GO.
In many Pokemon games, a Pokemon's starting stats are based on its "individual value," or "IV,".