Chespin’s armor is practically unstoppable, but it hasn’t grown enough of a shell to protect its front yet. It grows the armor from the nuts in its diet, with different colors if Chespin eats something different.

Quilladin don’t battle much in the wild, as predators give up after a couple bounces. With their shell too heavy to climb, they ram trees to make berries fall. The lack of competition makes them strong in their home environment, but weak to Trainers who can strategize around the shell.

Only other Pokémon can hurt Chesnaught enough to faint, with no other force coming anywhere close. It has to eat an entire garbage can of fiber every day to keep its armor in shape.