What is an Upgrade Item in World of Warcraft?

Upgrade items are items that can be added to weapons, armor and trinkets to boost their stats. get more info can obtain it by completing high-level keystones dungeons.

Trainers will require an upgrade to develop Porygon into its final version, Porygon2. But, they won't be able to take one from spinning PokeStops or Gyms as the