In Pokemon GO, you receive Stardust by catching Pokemon or hatching Eggs. Stardust can be used to power up any Pokemon in your collection; for example, you can power up a Pidgey using Stardust acquired by catching a Weedle. Check out the video below to find out the best times to use it to power up your Pokemon:
Video: Best times to use your Stardust in Pokemon GO
Pokémon Blog 
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