Gobblewonker

This is Gobblewonker from animated series Gravity falls, the Gobblewonker is a famous local lake monster.There are actually two answers to this:The Robot: The "monster" Dipper and Mabel track down is a giant, mechanical robot built and piloted by Old Man McGucket (Fiddleford McGucket). He built it to get attention because he felt lonely and neglected by the town.The Real Creature: At the very end of the episode, a real, green, scaly sea monster with tusks and fish hooks in its face surfaces behind the kids, proving that the actual creature does exist. History: The Gobblewonker is first seen when Grunkle Stan takes Dipper and Mabel to Gravity Falls Lake for some "family bonding time". Old Man McGucket runs into the pier, warning everyone that he's seen the Gravity Falls Gobblewonker, to which the gathered crowd reacts with skepticism since McGucket also says that he has "proof this time". After Dipper, Mabel and Soos are chased by the monster into a cave, where it crashes and short-circuits, they discover that the "Gobblewonker" they saw is actually a robot built by Old Man McGucket, who often creates extremely dangerous and destructive robots when he feels neglected or upset. The Gobblewonker robot in particular was due to being neglected and ignored by his son. However, it is revealed that the lake does house a real Gobblewonker, which is shown swallowing Dipper's dropped camera while swimming at the bottom of the lake at the end of the episode.