LAMBEAN - The Bean Pokemon
Lambeans are almost always found in groups, protected by a Bolderdash. They like to practice headbutting with each other.
DIGOT - The Balance Pokemon
Soon after evolving, the Digot leaves the safety of its group and climbs a rocky mountain or a cliff to look for a perfect rock. It uses its narrow hooves to climbing cliffs and rocks and its tail for balance. Once it finds it, Digot takes it wherever it goes, rolling the rock around while balanced on top of it. It spends its time headbutting the rock until it splits into two perfect halves.
BOLDERDASH - The Headbutt Pokemon
When a Digot manages to split its rock into two perfect halves, it evolves into a Bolderdash. Bolderdash reinforces its horns by wrapping them around the rock hemispheres. Spending so much time studying rocks also enabled it to use some rock type moves.