The Upgrade Item in Pokemon GO
The upgrade item in Pokemon GO is a special evolution item that can help certain creatures in your pocket increase their power. It's an important step to learning the evolution and expanding your Pokedex.
Players can acquire upgrade items by spinning Photo Disks at PokeStops and Gyms for seven days in a row, and also through event-specific Field Research tasks. However these items are not very popular and have a low drop rate.
It is used to evolve Porygon into Porygon2
In Pokemon Go, players can make use of a special item called the Upgrade to evolve certain Pokemon into their more powerful forms. The process isn't difficult, but does require a few steps. It gives a new dimension to the game.

One of the more distinctive Pokemon in the Pokemon franchise is Porygon, which can be transformed into Porygon2 and then into Porygon-Z. To unlock these evolutions, you'll need have a few items. These include the Upgrade disc and Dubious disc. These items aren't common, but they 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 unlock this item, players must to capture and transfer Porygon. Each capture and transfer will yield one Candy which is why it's best to collect a lot of the critters. Trainers can also obtain this item by spinning PokeStops that have the possibility of dropping the item along with other rewards.
The Dubious Disc, another rare item in Pokemon GO, can be used to develop Porygon's more powerful form. To acquire this item, players must collect 50 pieces of Porygon Candy. This can be achieved by taking a Porygon and taking them to Professor Willow, or walking with the Pokemon as their companion. Trainers can also acquire this rare item by spinning PokeStops though it's a bit more difficult to land on one.
Evolving a Porygon into its secondary form is a fun process that adds depth to the Pokemon GO experience. It requires a few special items and currency in the game, however, it's not too difficult to accomplish.
Unlike item upgrader in the series, Porygon can only be evolved into its second and final form by using an item called the Upgrade. It is extremely scarce and can be found through PokeStops spinning or doing Research Breakthroughs. You can also acquire the item if you trade a Porygon with the item or if you make use of a Special Trade item.
This is a unique drop from the Tier 4.
An upgrade item is an item that is used to enhance equipment by adding additional attribute bonuses. The players can find upgrades in the game's inventory, in karma merchants or as rewards for special events. They can be used as upgrades to weapons, armors, trinkets and gathering tools. Upgrades can be placed into any slot of an equipped device. However certain upgrades require an item above an aforementioned level to be added. The majority of upgrade components can be modified however the original 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 an upgrade item with the item that it is placed in, or by rerolling it with a reroll token. The upgraded item will have the same extra attributes as the original however, it will be upgraded to a higher level and tier. Each item comes with an upgrade level maximum and a minimum level. The levels of upgrade are determined by the item's tier, which is determined by its rarity and. Each tier is divided into three levels. Each level comes with its own upgrade cost and bonuses.
Generally upgrading an item will increase its main stat by a fixed amount, and also provide a random extra stat. The cost of upgrading an item will increase as its tier rises, but there are discounts available for certain items and the amount of upgrades required decreases with each step.
The upgrade item can be obtained by spinning Photo Disks in PokeStops or Gyms. However it has a low probability of dropping each day. It can be obtained by spinning at minimum one PokeStop Photo Disc or gym Photo Disc each day for 7 days, as well as through Research Tasks and task-specific to events.