When KayKay's Empoleon was a Piplup, it was really energetic and fun loving. KayKay received Piplup from Professor Rowan to start her Pokémon Journey
As a Prinplup
Piplup evolved into a Prinplup Bein' Bubbly While being frozen.
Prinplup later evolved in Marine Machine Where it fought through a fierce battle against a random person KayKay met while on her journey.