The Upgrade Item in Pokemon GO
The upgrade item in Pokemon GO is a special evolution item that helps certain creatures in your pocket to become more powerful. It's an important bridge to understanding the evolution process and expanding your Pokedex.
Players can upgrade their items by spinning Photo Discs in PokeStops or Gyms for a whole week and also by completing Field Research tasks that are specific to an event. These items are rare, but they do drop.
Porygon2 is a possible evolution item by using this item
In Pokemon Go players can make use of an item known as Upgrade to evolve Pokemon into more powerful forms. This process requires a few steps that aren't difficult to master and adds an extra dimension to the game's gameplay.
One of the most unique Pokemon in the Pokemon franchise is Porygon, which can be evolved into Porygon2 and then into Porygon-Z. These evolutions require a range of items to unlock, such as the Dubious Disc and Upgrade. These items aren't common, but they are not impossible to find in the game.
The Upgrade is a rare item that allows players to unlock the second level of evolution for Pokemon Porygon in Pokemon GO. To get this item, players must capture and transfer the Porygon. It's best to gather as many Porygons as possible. Each capture and transfer will yield one Candy. 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 evolve Porygon into its more powerful form. To acquire this item, players must gather 50 pieces of Porygon Candy. This can be accomplished by catching Porygons and transferring them to Professor Willow or walking with your Pokemon as a buddy. Trainers can also spin PokeStops to try to hit this item, however it is a little more difficult.

It's a great way to add some depth to your Pokemon GO experience. It requires a few unique items and currency in the game, but it's not terribly difficult to achieve.
Porygon unlike other Pokemon in the series can only transform into its final form using an item known as Upgrade. This item is extremely rare and can be obtained through PokeStops spinning or completing Research Breakthroughs. You can also get the item by trading the Porygon with the item attached or if you make use of an item that is a Special Trade item.
It is a special tier 4 drop
An upgrade item is an item used to improve equipment by adding attributes bonuses. Players can find upgrades within the game's inventory, karma merchants or as rewards from special events. They can be added to weapons, armor trinkets and gathering tools. An upgrade can be inserted into any slot on an equipped device. However, some upgrades require an item above certain levels to be added. The majority of upgrade components can be altered, but the previous component will be destroyed. 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.
Items can be upgraded by combining the upgrade item with the item it is placed in, or rerolling it with a token for reroll. The upgraded item will have the same extra attributes as the original but it will also have a new level and tier. Each item has a maximum upgrade level and a minimum level. The rarity of the item and its level determine the level. Each tier is broken up into three levels, and each level has its own amount of upgrade costs and bonuses.
Generally upgrading an item will increase its main stat by a fixed amount, and also provide a random extra stat. item upgrading to upgrade an item increases as its tier rises however there are discounts available for some items and the number of upgrades required decreases with each step.
The upgrade item is obtained by spinning Photo discs at PokeStops and Gyms but it is very unlikely to drop each day. It is obtained by spinning at minimum one PokeStop Photo Disc or gym Photo Disc every day for seven days and also through Research Tasks and task-specific to events.