Aquafall Machine
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The Aquafall Machine, also called the Aquafaller, is a structure located to the right of the Kelp Maze fast-travel point, in the northeast side of Rainbow Reef, next to the Dune Lagoon.
The player will unlock the Aquafall Machine while completing the "Rain or Shine" quest. After completing the quest, the player will unlock weather on the island, where it can be either raining or sunny! The Aquafall Machine will occasionally activate, making bubbles as it causes rain to fall somewhere around Friendship Island. The player does not need to be near the machine for it to activate. The weather forecast in the player’s menu tablet will show when it is an upcoming weather event.
After completing the "Rainy Day Delight" quest, the player will be able to manually activate the Aquafall Machine once a week by crafting a Rain Island Stone and placing it into the Aquafall Machine. Activating a weather machine causes the weather event to happen in a random region. A currently active machine cannot be manually activated until the weather event ends. Manually activating a machine during another weather event will end the other weather event even if they occur in different regions.
Rain
Rain lasts 15 minutes, and what appears during the rain depends on where it rains.
Rainfall Flowers will appear during rain in the Seaside Resort, Spooky Swamp, or Merry Meadow. When watered using the Watering Can, they produce Raindrops. There are 15 flowers per rain period. They do not regenerate with the use of Island Bouquets. Even if the player was somewhere else during the rainfall event, the Rainfall Flowers will remain until the Raindrops are collected or replaced by another rainfall event in the same region!
In Gemstone Mountain, rain makes the Soaking Slugler appear.
In Mount Hothead, the Shower Springtail can be found in the Hot Springs and along the coast.