Wait for the Moonlight event or any update that adds Moon Melon to the game
Check the Seed Shop for Moon Melon when it appears in rotation
Buy the Moon Melon seed if it is available
Use event rewards or limited-time crates if Moon Melon is included
Trade with other players if trading is supported and Moon Melon can be exchanged
Complete special quests or tasks that may reward Moon Melon seeds
Join the game during seasonal or lunar-themed events for a chance to obtain it