Leveling Up
The leveling system and experience gain is accurate to the actual Pokémon games. The only way to level up your Pokémon is through battles or using an item called Rare Candy. Leveling up also increases the happiness value of the Pokémon.
Battles
Defeating each Pokémon in a battle yields a specific amount of experience and effort value points, this can be viewed using the /info command.
TIP
The experience yield for some Pokémon has been edited for balancing purposes. This is indicated by the [Balanced] tag in the /info command.
Items
Items such as Exp Share, Exp Charm and Lucky Egg can be used to level up your Pokémon a lot faster.
TIP
All of the mentioned items can be used together to boost the experience gain even further.