The Upgrade Item in Pokemon GO
The upgrade item in Pokemon GO is a special enhancement item that helps certain creatures in your pocket become more powerful. It's an essential bridge to mastering evolution and expanding the Pokedex.
Players can upgrade their items by spinning Photo Discs at PokeStops or Gyms all day long, as well as by completing Field Research tasks that are unique to an event. However, these items have a low rate of dropping.

It is used to evolve Porygon into Porygon2.
In Pokemon Go players can utilize an item called Upgrade to transform Pokemon into more powerful versions. This isn't a difficult process, but does require some steps. It provides a fresh dimension to the gameplay.
One of the more distinctive Pokemon in the Pokemon franchise is Porygon, which can be transformed into Porygon2 and later into Porygon-Z. To unlock these evolutions, you'll need to have a few things. These include the Dubious disc and Upgrade. While these items are rare but they're not impossible to find in the game.
The Upgrade is a rare item that allows players to unlock the second stage of evolution for Pokemon Porygon in Pokemon GO. To unlock this item, players need to capture and transfer Porygon. It's best to collect as many Porygons as possible. Each capture and transfer will yield one Candy. Trainers can attempt to get this item by spinning PokeStops. They are likely to drop the item, together with other rewards.
The Dubious Disc, another rare item in Pokemon GO, can be used to develop Porygon's more powerful form. To obtain this item, players must collect 50 pieces of Porygon Candy. This can be achieved by catching Porygons, then transferring them to Professor Willow or walking with your Pokemon as a companion. Trainers can also try to acquire this rare item by spinning PokeStops, though it's a bit more difficult to find one.
It's a fun way give depth to your Pokemon GO experience. It requires a few specific items and in-game currency however, it's not too difficult to accomplish.
Porygon unlike other Pokemon in the series, can only change into its final form by using an item known as Upgrade. This item is extremely scarce and can only be found through PokeStops or by completing research Breakthroughs. However, it's possible to get the item by trading the Porygon while it has the item attached or by using an item that is a Special Trade Item.
It is a special tier 4 drop
Upgrades are items that can be used to upgrade equipment, by adding new attributes. Players can find upgrades in the game's inventory, in karma merchants or as rewards for special events. They can be used as upgrades to weapons, armors, trinkets and gathering tools. An upgrade can be put into any slot of an item that is equipped. However certain upgrades require an item that is above a certain level to be added. The majority of upgrade components can be altered however the prior component will be destroyed. Only a few types of upgrade are salvageable with high-tier salvage kits, such as the Black Lion Salvage Kit and Ascended Salvage Tool.
item upgrading can be upgraded by combining the upgraded item with the item that it is placed in, or by rerolling it with a reroll token. The rerolled item will have the same extra stats, but also a new level and tier. Each item has an upgrade level maximum and a level minimum. The item's rarity and level determine the level. Each tier is divided into three levels. Each level comes with its own upgrade costs and bonuses.
Generally upgrading an item will increase its main stat by a certain amount, and provide an extra stat that is random. The cost of upgrading an item increases with the tier it is placed in however, there are discounts on some items and the number of upgrades needed is reduced with each step.
The upgrade item is obtained by spinning Photo Disks in PokeStops or Gyms. However it has a low chance of dropping every day. It can be obtained by spinning at least one PokeStop Photo Disc or gym Photo Disc every day for 7 days as well as by completing research tasks and other task-specific events.