Here's the best time to use a Lucky Egg in 'Pokémon GO'

"Pokémon GO" has been out for nearly a week and now that you've mastered catching some basic Pokémon and maybe have even battled at a gym, you've probably stumbled upon a Lucky Egg or two. You know. These things: The Pokemon Company Unlike Pokémon eggs, which you need to walk around to hatch, Lucky Eggs give you double XP points for 30 minutes. Cool! However, Lucky Eggs aren't common like Caterpie and Weedle. You acquire one once you make it to level 9 (or earlier if you've spent some col...