Water / Grass / Fire
Powers up moves of the same type.
Litopplet, the Joyous Pokemon.
As children in the Alola region were growing more indecisive to choose a starter, Popplio, Rowlet, and Litten were taken into a lab for testing. In their efforts to create a great starter, they made Litopplet. Litopplet are actually very happy Pokemon, and don't seem to be in any pain from being fused.