Doraemon: Nobita's Key Adventure

Doraemon, with Nobita's help, uses a key from the 22nd century to create a mechanical city in the present, but the city is threatened by a series of crises. A sudden lightning strike causes the animals within the city to evolve into more powerful forms, and a group of thieves infiltrate the city, seeking to exploit its advanced technology. Furthermore, a mysterious golden creature, whose true form is unknown, emerges to add to the chaos.