In a Doraemon Hindi story, there is the gadget of the 'Memory Bread'. Nobita uses this bread to quickly learn for his exams. He just has to eat the bread and all the knowledge from the book he places on his head while eating gets stored in his memory. But it has a drawback. If he goes to the toilet, the knowledge goes away. This story is both funny and teaches about the importance of real study rather than shortcuts.
A very popular Doraemon Hindi story is about the 'Mini - Doraemon'. In this story, Doraemon creates a mini version of himself. This mini - Doraemon causes a lot of chaos as it has all of Doraemon's gadgets but is much smaller and sometimes gets lost. Nobita and the real Doraemon have to search for it all over the place. It's a story full of humor and action as they try to control the mini - Doraemon.
Well, the story of Doraemon is really extensive. Doraemon was sent back in time by Nobita's great - grandson because Nobita was having such a hard time in his present life. Doraemon uses his various gadgets like the 'Anywhere Door' which can take you to any place you want instantly, and the 'Memory Bread' that helps Nobita study (although with some comical side effects). It's a story full of friendship, adventure, and lessons about growing up as we follow Nobita's experiences with Doraemon by his side.
I know the following information about the movie version of Doraemon and Crayon Shinchan:
Doraemon: Diary of the Future: This is the first time Doraemon has entered the future world. It tells the story of the adventures of a group of primary school students in the diary.
2. Crayon Shin-chan: The Adventures of Nohara Shinosuke: This is the story of Crayon Shin-chan's first entry into the super-future world. It tells the story of the adventures of Nohara Shinosuke and his friends in the super-future.
3. Crayon Shinchan: Nobita's Dinosaur: This is the first time Crayon Shinchan has entered the real world. It is about a primary school student, Nohara Shinosuke, and his friends discovering a mysterious dinosaur.
Doraemon: Bamboo Dragonfly: This is the first time Doraemon has a bamboo dragonfly. It tells the story of a robot cat that can fulfill wishes.
5. Crayon Shin-chan: The Devil's Kiss: This is the story of Crayon Shin-chan's first entry into the Devil's World. It tells the story of a primary school student, Nohara Shinosuke, and his friends who were attacked by the Devil but eventually defeated the Devil.
Briefly, Doraemon is sent to Nobita from the 22nd century. He has a pocket full of gadgets. They deal with Nobita's school and life problems and have fun adventures.
Well, you could try looking on Indian movie-specific streaming services or websites. Sometimes, older movies are available on DVD rental services too. It might take a bit of searching around.