Final answer:
To obtain the DIY recipe for the golden watering can in the game, players need to achieve a 5-star town rating. Isabelle will present them with the recipe once the rating is achieved.
Step-by-step explanation:
To obtain the DIY recipe for the golden watering can in the game, players need to achieve a 5-star town rating. This means that the player's island needs to be developed with a high population of villagers, a variety of flowers, trees, and decorations, and an absence of weeds and trash. Once the 5-star rating is achieved, the player will receive a visit from Isabelle, who will present them with the DIY recipe for the golden watering can.