Walk: Pokéwalker
Its base catch rate is 255 out of 255 (higher is easier); the catch rate calculator works out your odds with each ball. For the look, the best colour match is Nest Ball or Safari Ball.
Evolution: Bonsly → Sudowoodo.
Bonsly in every game · Pokémon HeartGold & SoulSilver interactive map (Johto & Kanto)