Trade with friends for a chance of getting a Lucky Pokémon
Read on below to learn how to get Lucky Pokémon in Pokémon GO:
One of the many benefits to trading Pokémon with friends is that you have a chance at receiving a Lucky Pokémon. Lucky Pokémon are more likely to be strong opponents in battle, require less Stardust to power up, and appear with a shimmery effect in the Pokédex and the Pokémon Profile.
Although Pokémon turn into Lucky Pokémon at random when traded, the longer you have a Pokémon, the greater the chances that they will become Lucky Pokémon.

Source: Official Pokémon GO support page
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