Unknown: Exeggutor Island
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 Nest Ball or Safari Ball.
Evolution: Exeggcute → Exeggutor (Leaf Stone).
Exeggutor in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)