Walk: Area Zero
Its base catch rate is 45 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 Premier Ball or Timer Ball.
Evolution: Nacli → Naclstack (Level 24) → Garganacl (Level 38).
Garganacl in every game · Pokémon Scarlet & Violet interactive map (Paldea)