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I know about Lucky Eggs, which multiple experience by 2X for 30 minutes. Are there any others?
Related, but not a multiplier, you get a bonus if you visit 10 different poke stops in 30 minutes.
if you hit 10 or more different poke stops in 30 minutes, experience doubles for a period of time
Until now there are no known experience multipliers besides the Lucky Eggs in Pokémon Go.
If you seek for Powerleveling I refer to this guide.
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