The Upgrade Item in Pokemon GO
The upgrade item in Pokemon GO is a special enhancement item that helps certain monsters in the pocket to become more powerful. It's a key bridge to mastering evolution and expanding the Pokedex.
Players can upgrade their items by spinning Photo Discs in PokeStops and Gyms for seven days in a row, and also by completing event-specific Field Research tasks. These items are scarce, but they do drop.
It is used to transform Porygon into Porygon2
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 several steps that aren't difficult to accomplish and adds an extra dimension to the game's gameplay.
One of the more distinctive Pokemon in the Pokemon franchise is Porygon that can be transformed into Porygon2 and then into Porygon-Z. These evolutions require a variety of items to unlock, such as the Upgrade and Dubious Disc. These items are scarce, but are not impossible to find in the game.
The Upgrade is a rare item that is used to unlock the second level of evolution for Pokemon Porygon in Pokemon GO. To obtain this item, players need to capture and transfer Porygon. It's best to capture as many Porygons possible. Each capture and transfer will yield one Candy. Trainers can try to obtain this item by spinning PokeStops. These have a chance to drop the item, as well as other rewards.
The Dubious Disc, another rare item in Pokemon GO, can be used to evolve Porygon's more powerful form. To obtain this item, players must gather 50 pieces of Porygon Candy. This can be achieved by collecting Porygon, transfer them to Professor Willow, or walking with the Pokemon as their companion. Trainers can also spin PokeStops in order to try to hit this item, however it's a bit more difficult.
Evolving a Porygon into its secondary form is a fun process that adds depth to the Pokemon GO experience. It requires a few unique items and in-game currency, but it's not terribly difficult to accomplish.
Porygon, unlike most Pokemon in the series can only transform into its final form by using an item known as Upgrade. This item is extremely rare and can only be found by spinning PokeStops, or by working on Research Breakthroughs. You can also obtain the item by trading the Porygon with the item attached, or if you use a Special Trade item.

This is a special drop from Tier 4.
Upgrades are items that can be used to improve equipment, by adding new attributes. Players can find upgrades in the game's inventory, in karma merchants or as rewards from special events. item upgrading can be used as upgrades to armors, weapons trinkets, gathering tools, and trinkets. Upgrades can be added to any slot on a unit. However, some upgrades require a product above an aforementioned level to be added. Most upgrade components can be replaced but doing so will destroy the previous one. Only a handful of types of upgrade can be salvaged using salvage kits of high-end quality like the Black Lion Salvage Kit and Ascended Salvage Tool.
Upgrades can be made by either combining an upgrade item with the item it is placed in or by rerolling the item using an token that rerolls. The new item will have the same extra attributes as the original however, it will have a new level and tier. Each item has a maximum upgrade level and a minimum level. The item's rarity and level determine the tier. Each tier is broken down into three levels, and each has a different amount of upgrade costs and bonuses.
In general upgrading an item can increase its primary stat by a specific amount and offers a random additional stat. As an item's tier rises, the cost to upgrade it will rise. However there are discounts on specific items and with each step the amount of upgrades required will decrease.
The upgrade item can be obtained by spinning Photo Discs at PokeStops and Gyms but it is very unlikely to be dropped every day. It is also available as a reward for a seven-day streak of spinning at least one PokeStop or gym Photo Disc each day, and through research tasks that are specific to an event.