The Upgrade Item in Pokemon GO
The upgrade item is an evolution item in Pokemon GO that can make certain creatures in the pocket evolve into more powerful versions. It's an important bridge to learning the evolution and expanding your Pokedex.
Players can upgrade their items by spinning Photo Discs in PokeStops and Gyms for seven days in a row and also by completing specific event-related Field Research tasks. However, item upgrading are not very popular and have a low drop rate.
It is used to transform Porygon into Porygon2
In Pokemon Go players can utilize a unique item called the Upgrade to transform certain Pokemon into more powerful forms. This isn't a difficult process, but does require a few steps. It adds a new dimension to the game.
One of the more unique Pokemon in the Pokemon franchise is Porygon that can be evolved into Porygon2 and later into Porygon-Z. These evolutions require a number of items to unlock, such as the Upgrade and Dubious Disc. These items aren't common, but not impossible to locate in the game.
The Upgrade is a rare item that allows players to unlock the second stage of evolution for Pokemon Porygon in Pokemon GO. To get this item, players have to capture and transfer Porygon. Each capture and transfer will give one Candy which is why it's best to gather a large amount of the critters. Trainers can also try to obtain this item by spinning PokeStops, that have the possibility of dropping the item in addition to other rewards.
The Dubious Disc, another rare item that is found in Pokemon GO, can be used to evolve Porygon's more powerful form. To obtain this item, players need to collect 50 pieces of Porygon Candy. This can be accomplished by catching Porygons, transferring them to Professor Willow or walking with your Pokemon as a buddy. Trainers can also spin PokeStops in order to try and get this item, however it is a little more difficult.
It's a fun way give depth to your Pokemon GO experience. It's not difficult however, you'll need some special items and in-game money.

Porygon like other Pokemon in the series can only change into its final form by using an item known as Upgrade. It is extremely scarce and can be obtained by spinning PokeStops or completing Research Breakthroughs. You can also obtain the item when you trade a Porygon with the item attached, or if you use the Special Trade item.
This is a unique drop from Tier 4.
An upgrade item is a product used to improve equipment by adding additional attribute bonuses. Players can find upgrades within the game's inventory, in karma merchants, or as rewards from special events. They can be used as upgrades to weapons, armors trinkets, gathering tools, and trinkets. Upgrades can be added to any slot on a unit. Certain upgrades require an item with a higher level be added. The majority of upgrade components can be replaced however, it will damage the previous one. There are a few kinds of upgrade can be salvaged using salvage kits of high-end quality like the Black Lion Salvage Kit and Ascended Salvage Tool.
Items can be upgraded by combining an upgrade item with the item that it is placed in, or by rerolling it using a reroll token. The upgraded item will have the exact stats as the original, however, it will be upgraded to a higher level and tier. Every item has an upgrade level maximum and level minimum. The item's rarity and level determine the tier. Each tier is divided into three levels. Each level has its own upgrade cost and bonuses.
Generally, upgrading an item will increase its primary stat by a predetermined amount, and provide an extra stat that is random. As item upgrade rises it will cost more to upgrade it will rise. However, there are discounts for certain items and with each upgrade, the number of upgrades needed will decrease.
The upgrade item is obtained by spinning Photo Disks in PokeStops or Gyms. However, it has a very low chance of dropping every day. It is earned by spinning at least one PokeStop Photo Disc or gym Photo Disc each day for seven days, as well as through Research Tasks and task-specific to events.