The Upgrade Item in Pokemon GO
The upgrade item is a special evolving item in Pokemon GO that can make certain monsters in your pocket evolve into stronger versions. It's a crucial way to master evolution and expanding the Pokedex.
Players can acquire upgrade items by spinning Photo Discs in PokeStops and Gyms for seven days in a row, and also through event-specific Field Research tasks. However they have a low drop rate.
Porygon2 is a possible evolution item by using this item

In Pokemon Go, players can use a special item called the Upgrade to transform certain Pokemon into their more powerful forms. The process involves some steps that aren't difficult to accomplish and adds an additional dimension to the game's gameplay.
Porygon is among the most distinctive Pokemon in the Pokemon series. It can be evolved to Porygon2 or Porygon-Z. These evolutions require a variety of items to unlock, such as the Upgrade and Dubious Disc. These items are rare but are not impossible to find in the game.
The Upgrade is a scarce item that is used to unlock the second stage of evolution for Pokemon Porygon in Pokemon GO. To get this item, players have to capture and transfer Porygon. Each capture and transfer will result in one Candy and it is recommended to collect a lot of the critters. Trainers can also try to acquire this item by spinning PokeStops, that have the possibility of 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 must gather 50 pieces of Porygon Candy. This can be achieved by taking a Porygon and transferring them to Professor Willow, or walking with the Pokemon as a companion. Trainers can also acquire this rare item by spinning PokeStops, though it's a bit more difficult to get one.
Evolving a Porygon into its secondary form is a thrilling process that adds a bit of depth to the Pokemon GO experience. It requires a few specific items and in-game currency but it's not terribly difficult to accomplish.
In contrast to other Pokemon in the series, Porygon can only be transformed into its second and final form with an item called the Upgrade. It is extremely scarce and can be found by spinning PokeStops, or by completing Research Breakthroughs. However, it's possible to get the item by trading the Porygon when it has the item attached or using a Special Trade item.
It is a Tier 4 exclusive drop
Upgrades are items that can be used to enhance equipment by adding new features. Upgrades can be found in the game's Inventory, from karma merchants or as rewards for special events. They can be used as upgrades to weapons, armors trinkets, gathering tools and trinkets. Upgrades can be added to any slot on the unit. However, some upgrades require a product above an aforementioned level to be added. The majority of upgrade components can be replaced but doing so will destroy the previous one. There are a few kinds of upgrade are salvageable with high-tier salvage kits such as the Black Lion Salvage Kit and Ascended Salvage Tool.
Upgrades can be accomplished by either by combining an upgrade item with the item it's placed in, or by rerolling the item using an token for rerolling. The new item will have the same stats as the first, but it will also be upgraded to a higher level and tier. Each item has a maximum upgrade level and a minimum item level. The levels of upgrade are determined by the item's level, 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.
Generally, upgrading an item will boost its primary stat by a fixed amount, and also provide a random extra stat. As the tier of an item increases, the cost to upgrade it will rise. However there are discounts on certain items, and with each step the amount of upgrades required will decrease.
The upgrade item is obtained by spinning Photo Discs in PokeStops or Gyms. However it has a low chance of dropping every day. It can be earned by spinning at least one PokeStop Photo Disc or gym Photo Disc every day to earn seven days and also through Research Tasks and task-specific to events.