The Upgrade Item in Pokemon GO
The upgrade item in Pokemon GO is a special evolution item that helps certain pocket monsters to become more powerful. It's an important bridge to understanding the evolution process and expanding your Pokedex.
Players can acquire upgrade items by spinning Photo Discs in PokeStops and Gyms for seven days in a row, and also through events-specific Field Research tasks. However they have a low drop rate.
It is used to evolve Porygon into Porygon2
In Pokemon Go players can use a special item called the Upgrade to transform certain Pokemon into their more powerful forms. The process involves some steps however it's not difficult to master and adds some extra depth to the game's gameplay.
One of the most distinctive Pokemon in the Pokemon franchise is Porygon that can be evolved into Porygon2 and then into Porygon-Z. These evolutions require a number of items to unlock, such as the Dubious Disc upgrade and the Upgrade. These items are scarce, but not impossible to locate in the game.
item upgrader is a rare item that is used to unlock the second level of evolution for Pokemon Porygon in Pokemon GO. To get this item, players must to capture and transfer Porygon. Each capture and transfer will give one Candy, so it's best to collect a large number of the creatures. Trainers can try to collect this item by spinning PokeStops. They have a chance to drop 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 acquire this item players must gather 50 pieces of Porygon Candy. This can be achieved by catching Porygons, then transferring them Professor Willow or walking with your Pokemon as a companion. Trainers can also get this rare item by spinning PokeStops, though it's a bit more difficult to land on one.
It's a great way to add some depth to your Pokemon GO experience. It's not difficult, but you will need some special items and money from the game.

Porygon unlike other Pokemon in the series can only change into its final form using an item known as Upgrade. This item is extremely rare and can be obtained by spinning PokeStops or doing Research Breakthroughs. However, it is possible to get the item by trading the Porygon when it has the item attached or by using a Special Trade Item.
This is a unique drop from tier 4.
An upgrade item is a product that can be used to upgrade equipment by adding additional attribute bonuses. Upgrades are available in the game's Inventory from karma merchants or as rewards for events. They can be added to armor, weapons, trinkets, and gathering tools. Upgrades can be added to any slot on a unit. Certain upgrades require that an item with higher quality be added. The majority of upgrade components can be replaced, however, it will damage the previous one. 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 that it is placed in, or by rerolling it with a reroll token. The rerolled item will have the same extra stats, but also a new tier and level. Every item has 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 as well as its level. Each tier is divided into three levels. Each level has its own upgrade costs and bonuses.
In general, upgrading an item increases its primary stat by a certain amount and gives you a random extra stat. The cost to upgrade an item increases as its tier rises, but there are discounts for certain items, and the number of upgrades required decreases with each step.
The upgrade item is obtained by spinning Photo Discs at PokeStops or Gyms. However, it has a very low probability of dropping each day. It is also available as a reward for a seven-day streak of spinning at minimum one PokeStop or gym Photo Disc each day, and through specific research tasks for events.