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Each Pokemon has Individual Values (IVs), which function as their stats: HP, Attack, Defense, Speed, Special Attack, and Special Defense. IVs are present inPokemon GO, but they only measure a Pokemon’s Attack, Defense, and Speed. They’re measured on a scale of 0-15, and it’s through these measurements that a Pokemon is given an Appraisal from 0-4 stars.
InPokemon GO, trainers will be catching Pokemon left and right. One Pokemon’s CP will be different from another, and this applies to their IVs/Appraisal as well. In fact, it’s likely that trainers will catch more 0-star Pokemon than 3-star. Players may be more than ready to Transfer them, but there’s some value in keeping 0-star Pokemon.

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Why You Should Transfer 0-Star Pokemon (& Why You Should Not)
Players are free to Transfer whichever Pokemon they want. In the case that their Pokemon Storage is full, they may want to Transfer a 0-star rather than a 3-star to make room. To transfer Pokemon, do the following:
If a Pokemon is an Event, Shiny, XXL/XXS, or a Legendary/Mythical,Pokemon GOwill ask playerstwiceif they want to make the Transfer. Also, if a Pokemon is marked as aFavorite, then players will need to tap theStar iconbefore they can Transfer it.

InPokemon GO, the Pokemon with ahigher CP (Combat Power)is generally preferred even if the Pokemon haslow IVs. Although it’s not a traditional Level-system, the CP somewhat functions as a Pokemon’s “Level” inGO. This is why Pokemon with high CP are difficult to catch compared to a Pokemon with lower CP.
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Are 0-Star Pokemon Good for PVP? (Pokemon GO League)
0-star Appraisal Pokemon can be good in a Pokemon Leagueas long as they have high CP. However, Pokemon Leagues have aCP-cap. The Great League caps off at1500while the Ultra League is2500. If a 0-star’s CP is above these numbers, thenit can’t be used.
Chances are when battling other players in Leagues,they’re going to bring their best Pokemon. So, it may not be wise to use a 0-star for the Ultra League. If the 0-star is the only Pokemon that players have with the highest CP, then it’s worth giving it a chance and signing it up for the leagues.

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Should You Transfer 0-Star Shadow Pokemon?
When a Team GO Rocket Grunt/Leader is defeated, players will have a Bonus Challenge. This is where they can snag one of the Grunts' Shadow Pokemon (usually the first one they throw out in battle). Shadow Pokemon can only be caught with Premier Balls, which players will get at the end of a Team GO Rocket battle. The amount of Premier Balls is influeced by the player’s performance in battle.
A Shadow Pokemon may have a0-star Appraisal. However,Shadow Pokemon have the “Shadow Bonus” next to their Fast and Charged Attacks. This means they’ll dealextra damage against an opponentat the cost ofhaving lower Defense.
Shadow Pokemon that arePurifiedwill sometimes have their Appraisal increased. It will also lose the Shadow Bonus effect. So, if a Shadow Pokemon is 0-stars but has decent Attacks and CP, it’s better to leave it unpurified for future battles.