Umberto was a strange old man who lived on the island where a Kabuto Fossil was found. When Nurse Joy brought an excavation crew to help her find more Fossils, he decided to do everything he could to get rid of them. His method of choice was to dislodge giant boulders from a cliff and make them fall on them. His intention was not to hurt them but merely to scare them away.
Soon, Ash and his friends spotted him and chased after him. When they caught up with him, he explained that if the Kabuto Fossils were disturbed, a red moon would appear and the island would be swallowed by the sea. Nurse Joy ignored his warning and continued to dig up the Fossils.
Soon, Umberto's prediction came true. The red moon appeared, causing the Kabuto Fossils to come back to life. Nurse Joy then realized that the island must have formed around the Kabuto Fossils. Because they were being revived, the island began to fall apart. The boats were also on the other side of the island which meant that no one could escape. Umberto then told them to go to the forest to build rafts. With the help of Ash and Misty's Water-type Pokémon and the rafts, they all escaped the island.
Nurse Joy later apologized to Umberto for ignoring his warning.