Gobblewonker robot

 (often referred as the Gobblewonker in short) is giant monster robot invented by Old Man McGucket to pretend to be the lake monster in Lake Gravity Falls.

History
As the response to his son's indifference, Old Man McGucket built the 15-ton aquatic robot, trying to get attention from Gravity Falls. In "The Legend of the Gobblewonker", during the Fishing Season: Opening Day, McGucket claims the existence of the Gobblewonker the lake monster, only to be mocked by people around him. His story catches Dipper and Mabel's attention, so they go to Scuttlebutt Island via Soos' boat, S.S. Cool Dude, to get photos of the monster to win the prize from a photo contest. When Dipper is frustrated for unsuccessful search for the monster, the robot emerge from the lake and starts to chase Dipper, Mabel, Soos and their boat, and destroys numerous boats from other townspeople. The chase ends up by the robot stuck in a cave behind the falls and destroyed by a falling rock. It's soon revealed that the "Gobblewonker" is a robot controlled by Old Man McGucket inside, who confesses his true attempt to build it and his other invention. McGucket proceeds to work on his "Death Ray" inside the robot.

In "Headhunters," a small prototype of Gobblewonker's head can be seen as scrap metal behind Old Man McGucket in the Gravity Falls Junkyard. During Dipper's "Voice Over" story in "Bottomless Pit!", he encounters Old Man McGucket in the junkyard and mentions the event of the robot chasing him, Mabel and Soos. In "Weirdmageddon 3: Take Back The Falls," the head and neck of ther robot are incorporated into the Shacktron and are able to catch and eat Eye-Bats.

Appearance
The Gobblewonker robot was described by Old Man McGucket as having a long neck like a giraffe, and wrinkly skin like Grunkle Stan. (in contrast, the real Gobblewonker does have a long neck, but it has green, scaly skin) Its eyes are dark green (yellow when glowing) and its lower jaw overlaps its upper jaw. It has two tusks along with other sharp teeth, and its head has two fish hooks stuck in it, one on its nostril, and one just above its eye. It has short legs with webbed feet and its tail has a fin like a fish. It has a long mane like a horse's that runs all the way down its back.

Trivia

 * The robot is coal powered.

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