The Upgrade Item in Pokemon GO
The upgrade item is an evolution item in Pokemon GO that can make certain pocket monsters change into stronger versions. It's a key bridge to mastering evolution and expanding the Pokedex.
Players can acquire upgrade items by spinning Photo Disks at PokeStops and Gyms for seven days in a row and also through events-specific Field Research tasks. However they are not very popular and have a low drop rate.
Porygon2 can be developed using this item
In Pokemon Go players can make use of a special item called the Upgrade to transform certain Pokemon into more powerful forms. This process requires a few steps however it's not difficult to accomplish and adds some extra depth to the game's gameplay.

Porygon is among the most unique Pokemon in the Pokemon series. It can be evolved to Porygon2 or Porygon-Z. These evolutions require a range of items to unlock, such as the Dubious Disc upgrade and the Upgrade. These items are scarce, but are not impossible to find in the game.
item upgrade is a rare item that allows players to unlock the second stage of evolution for the Pokemon Porygon in Pokemon GO. To unlock this item, players need to capture and transfer the Porygon. It's best to collect as many Porygons as possible. Each capture and transfer will result in one Candy. Trainers can try to collect this item by spinning PokeStops. These have a chance to drop the item as well as other rewards.
The Dubious Disc is another rare item in Pokemon GO that can be used to evolve Porygon into its more powerful form. To acquire this item, players must gather 50 pieces of Porygon Candy. This can be achieved by taking a Porygon and then transfer them to Professor Willow, or walking with the Pokemon as their companion. Trainers can also try to acquire this rare item by spinning PokeStops, however it's more difficult to get one.
Evolving a Porygon into its secondary form is a fun process that adds depth to the Pokemon GO experience. It's not difficult but you'll require some special items as well as in-game currency.
Contrary to the majority of Pokemon in the series, Porygon can only be evolved into its second and final form by using an item called the Upgrade. This item is extremely rare and can only be found by spinning PokeStops, or by doing research Breakthroughs. You can also acquire the item by trading the Porygon with the item attached, or if you use an item that is a Special Trade item.
It is a Tier 4 exclusive drop
An upgrade item is a product used to improve equipment by adding additional attribute bonuses. Upgrades can be found in the game's Inventory from karma merchants, or as rewards for special events. They can be added to armor, weapons trinkets and gathering tools. An upgrade can be inserted in any slot on an item that is equipped. Certain upgrades require that an item of higher quality be added. The majority of upgrade components can be replaced, however, doing so could destroy the previous one. Only a handful of upgrade types can be salvaged using high-tier salvage tools, for instance Black Lion Salvage Kit or Ascended Salvage Tool.
Items can be upgraded by combining the upgraded item with the item that it is placed in, or by rerolling it using a reroll token. The upgraded item will have the same stats as the original, however, it will have a new level and tier. Each item has a maximum level of upgrade and a minimum item level. Upgrade levels are determined by the item's tier, which is determined by its rarity as well as its level. Each tier is divided into three levels. Each level has its own upgrade cost and bonuses.
In general upgrading an item boosts its main stat by a specific amount and offers a random additional stat. The cost to upgrade an item is increased as its tier rises however there are discounts for certain items and the amount of upgrades needed is reduced with each step.
The upgrade item can be obtained by spinning Photo Discs at PokeStops and Gyms, though it is very unlikely to be dropped every day. It can also be obtained as a reward for a seven-day streak of spinning at least one PokeStop or gym Photo Disc per day, and through event-specific Research Tasks.