Did something fun today:
Trying to get the most experience gain, and most level gain, at once.
In White 2 White Tree Hollow, I’m fighting against a level 82 trainer Blissey (which yields the most experience), using a level 1 traded Happiny (because it’s in the Fast growing group) holding a Lucky Egg, using Exp boost +3, and defeating the Blissey with a level 100 Pokemon.
The result is a LOT of experience =D
Though I wonder if the number is capped though, because I did some calculating afterwards, and I should have gotten a lot more.