Lucky egg

https://www.androidcentral.com/best-way-use-lucky-egg-pokemon-go

you need to use them to their fullest possible extent. A Lucky Egg will double all of the XP you get for 30 minutes, so you want to spend that time wisely. There are a couple of strategies floating around for getting the most out of Lucky Egg, but this one seems to work best so far.

Before you use a Lucky Egg, make sure you have the following:

• Common Pokémon to evolve
• Lure Module or Incense
• Lots of Poké Balls

Head to your favorite local place where there's a Pokéstop and a Gym nearby one another, or a place with multiple Pokéstops in close proximity. When you get there, drop a Lure Module on a Pokéstop and activate your Lucky Egg. The countdown from 30:00 will begin immediately, so it's time to get to work. Start by evolving all of your common Pokémon. Every Pidgey into a Pidgeotto, every Weedle into a Kakuna, and so on.