The Upgrade Item in Pokemon GO
The upgrade item in Pokemon GO is a special evolution item that can help certain pocket monsters increase their power. It's an important step to learning the evolution and expanding your Pokedex.
Players can purchase upgrade items by spinning Photo Discs at PokeStops and Gyms for seven days in a row and through events-specific Field Research tasks. These items are scarce however they are available.
Porygon2 can be developed by using this item

In Pokemon Go players can utilize a unique item called the Upgrade to transform certain Pokemon into their more powerful versions. This process requires a few steps, but it's not difficult to do and provides an extra dimension to the game's gameplay.
Porygon is among the most distinctive Pokemon in the Pokemon series. It is able to evolve to Porygon2 or Porygon-Z. To unlock these evolutions, you'll need to have a few items. These include the Dubious disc and Upgrade. Although these items aren't common but they're not impossible to find in the game.
The Upgrade is a rare item used to unlock the second evolution stage for the Pokemon Porygon. To get this item, players must capture and transfer a Porygon. It's best to capture as many Porygons possible. Each capture and transfer will result in one Candy. Trainers can also obtain this item by spinning PokeStops which have a chance 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 have to collect 50 pieces of Porygon Candy. This can be accomplished by catching Porygons and transferring them Professor Willow or walking with your Pokemon as a friend. Trainers can also spin PokeStops to attempt to hit this item, however it is a little more difficult.
Transforming a Porygon into a secondary form is a fun process that adds some depth to the Pokemon GO experience. It's not too difficult to do, but you will need some special items and in-game currency.
Unlike most Pokemon in the series, Porygon can only be transformed into its second and final form using an item called the Upgrade. It is extremely rare and can only be obtained through PokeStops or by working on research Breakthroughs. However, it's also possible to obtain the item by trading with a Porygon when it has the item attached or by using the Special Trade item.
It is a Tier 4 exclusive drop
An upgrade item is a product used to improve equipment by adding attributes bonuses. Upgrades are available in the game's Inventory from karma sellers, or as rewards for events that are special. They can be used as upgrades to armors, weapons, trinkets and gathering tools. An upgrade can be inserted into any slot of an equipped unit. Some upgrades require that an item with an upper level be added. The majority of upgrade components can be changed however the prior component will be destroyed. Only a few upgrade types can be salvaged with high-end salvage tools, such as Black Lion Salvage Kit or Ascended Salvage Tool.
Items can be upgraded by combining an upgrade item with the item that it is placed in, or rerolling it using a reroll token. The rerolled item will have the same additional stats and features a different tier and level. Each item has a maximum upgrade level and a minimum item level. The levels of upgrade are determined by the item's tier, which is determined by its rarity as well as its level. Each level is divided into three levels. Each level comes with its own upgrade costs and bonuses.
Generally upgrading an item will increase its primary stat by a predetermined amount, and also provide an additional stat randomly. As the tier of an item increases and the cost of upgrading it will increase. However there are discounts on certain items and with each upgrade, the amount of upgrades required will decrease.
The upgrade item can be obtained by spinning Photo Discs at PokeStops or Gyms. However, item upgrade has a very low probability of dropping each day. It can also be obtained as a reward for a seven-day streak of spinning at least one PokeStop or gym Photo Disc every day, or through event-specific Research Tasks.