The Upgrade Item in Pokemon GO
The upgrade item is a special evolutionary item in Pokemon GO that can make certain creatures in the pocket evolve into more powerful versions. It's a crucial step towards learning the evolution and expanding your Pokedex.
The players can upgrade their items by spinning Photo Discs at PokeStops or Gyms all day long and through Field Research tasks that are specific to an event. However these items have a low rate of dropping.
Porygon2 is a possible evolution item by using this item
In Pokemon Go players can make use of an item known as Upgrade to transform Pokemon into more powerful forms. This process is not difficult however it requires some steps. It provides a fresh dimension to the game.
Porygon is one of the most distinctive Pokemon in the Pokemon series. It can be transformed to Porygon2 or Porygon-Z. These evolutions require a number of items to unlock, such as the Upgrade and Dubious Disc. While these items are rare but they're 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 must capture and transfer a Porygon. Each capture and transfer will give one Candy and it is recommended to collect a large number of the creatures. Trainers can also get 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 evolve Porygon into its more powerful form. To obtain this item, players must collect 50 pieces of Porygon Candy. This can be achieved by collecting Porygon and transferring them to Professor Willow, or walking with the Pokemon as their buddy. Trainers can also try to obtain this rare item by spinning PokeStops however it's more difficult to land on one.
It's a fun way add some depth to your Pokemon GO experience. It's not difficult but you'll need some special items and money from the game.

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 only be obtained by spinning PokeStops, or by doing research Breakthroughs. You can also get the item if you trade an Porygon with the item attached or if you make use of 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. Players can find upgrades in the game's inventory, in karma merchants or as rewards from special events. They can be added to armor, weapons, trinkets, and gathering tools. Upgrades can be added to any slot on the unit. However, some upgrades require a product above certain levels to be added. The majority of upgrade components can be changed however the prior component will be destroyed. Only a few types of upgrades can be salvaged using high-tier salvage tools, like the Black Lion Salvage Kit or Ascended Salvage Tool.
Items can be upgraded by combining an upgrade item with the item it is placed in, or by rerolling it using a reroll token. The rerolled item has the same stats as the original, but also a new level and tier. Every item has an upgrade level maximum as well as a level minimum. The rarity and level of the item determine the tier. Each level is divided into three levels. Each level has its own upgrade cost and bonuses.
In general upgrading an item boosts its primary stat by a certain amount, and gives you a random extra stat. The cost to upgrade an item will increase as its tier rises, but there are discounts on certain items, and the number 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 unlikely to drop every day. It can be obtained by spinning at minimum one PokeStop Photo Disc or gym Photo Disc every day for a 7-day streak, as well as through research tasks and other task-specific events.