The Upgrade Item in Pokemon GO
The upgrade item in Pokemon GO is a special evolution item that can help certain monsters in the pocket to become more powerful. It's a key step towards mastering evolution and expanding the Pokedex.
Players can acquire upgrade item s by spinning Photo Disks at PokeStops and Gyms for seven days in a row, and also by completing specific event-related Field Research tasks. These items are rare but they do drop.
It is used to evolve Porygon into Porygon2
In Pokemon Go, players can make use of a special item called the Upgrade to evolve certain Pokemon into their more powerful versions. The process involves some steps however it's not difficult to accomplish and adds an additional dimension to the game's gameplay.

Porygon is one of the most unique Pokemon in the Pokemon series. It can be transformed to Porygon2 or Porygon-Z. These evolutions require a number of items to unlock, such as the Dubious Disc upgrade and the Upgrade. These items are scarce, but not impossible to locate in the game.
The Upgrade is a very rare item that allows you to unlock the second stage of evolution for the Pokemon Porygon. To obtain this item, players must capture and transfer the Porygon. Each capture and transfer will give one Candy and it is recommended to gather a large amount of the creatures. Trainers can also acquire this item by spinning PokeStops which are likely to dropping the item along with other rewards.
The Dubious Disc is another rare item in Pokemon GO that can be used to transform Porygon into its more powerful form. To obtain this item, players need to collect 50 pieces Porygon Candy. This can be achieved by catching Porygons and transferring them to Professor Willow or walking with your Pokemon as a buddy. Trainers can also spin PokeStops in order to try and get this item, but it's a bit more difficult.
Evolving a Porygon into its secondary form is a thrilling process that adds depth to the Pokemon GO experience. It's not difficult however, you'll need some special items and money from the game.
Porygon like other Pokemon in the series can only change into its final form using an item called Upgrade. This item is extremely scarce and can only be found through PokeStops or by doing research Breakthroughs. It is possible to get the item by trading the Porygon when it has the item attached, or by using a Special Trade item.
This is a unique drop of tier 4.
Upgrades are items that can be used to enhance equipment, adding new features. Players can find upgrades in the game's inventory, karma merchants or as rewards for special events. They can be added as upgrades to weapons, armors trinkets, gathering tools and trinkets. Upgrades can be placed in any slot on an equipped device. Certain upgrades require that an item of an upper level be added. Most upgrade components can be replaced, however, doing so could destroy the previous one. Only a few types of upgrades can be salvaged by using top-tier salvage tools, such as Black Lion Salvage Kit or Ascended Salvage Tool.
item upgrade can be made by by combining an upgrade item with the item it's placed into or by rolling the item using a token for rerolling. The rerolled item will have the same stats as the original, but also a new level and tier. Each item comes with an upgrade level maximum and level minimum. The rarity of the item and its level determine the level. Each tier is divided into three levels, and each has its own set of upgrade costs and bonuses.
Generally upgrading an item will increase its main stat by a certain amount, and also provide a random extra stat. As the tier of an item increases and the cost of upgrading it will rise. However, there are discounts for certain items and with each upgrade, the amount of upgrades required will decrease.
The upgrade item is obtained by spinning Photo Discs at PokeStops and Gyms but it is very unlikely to be dropped every day. It can also be obtained as reward for a 7-day streak of spinning at least one PokeStop or gym Photo Disc per day, and through event-specific Research Tasks.