If you're looking for anime similar to 21 Emon, you might like these titles.
To confirm that birds descend from dinosaurs, Dorami and her friends from the 22nd century use a time machine to go millions of years back in time.
The anime centers on an elementary student named Eiji Toumatsu, and his "inspiration" buddy, a dog named Pochirou. One day Eiji finds a mysterious book called the "Pikachin Research Book," and learns about the Pikachin Kit. He also orders a pair of "Cunning Glasses" from Amazon that will help him find his inspiration.
On the planet Radion, representatives from many worlds have gathered to make a choice: do they allow Earth, who still believes they are the only intelligent life in the universe, to join the Galactic Union of Worlds? Many are skeptical, so a plan has been devised: Prince Planet, a Universal Peace Corps member, will travel to Earth; and disguised as a normal boy, he will help fight evil and injustice and help instill a sense of peace with the Earthlings! Alongside trusty friends, Prince Planet uses the power of his pendant for the greater good!
Two-time Beyblader champion Tyson has a new profession: teacher! In his spare time he instructs children on the ways of the 'blades', but his ego is soon disrupted once more by the entrance of a new challenger: the fiery-haired Daichi! Things heat up more when the next Beyblade World Championship is announced, but there’s a catch: prospective champions must qualify with a tag team. As members of the Bladebreakers leave to hopefully become the best Beyblader around, Tyson is left to train his hardest. Can Tyson retain his championship title for yet a third time?
After winning the title of World Champion Beyblader, Tyson’s ego couldn’t be more extreme. The other members of the Bladebreakers have moved on to tasks of their own: Max is studying up at a research lab, Ray returned home and is teaching kids how to play the game, and Kai has disappeared. Their thrill of winning soon fades as each member is targeted one by one by hooded opponents who possess blades with invisible bit-beasts within! Unfortunately for the gang, they are also being hunted by a secret evil organization who wants the Bladebreakers’ bit beasts for themselves. Countless battles and fierce opponents await our champions!
Nobita's dad stumbled upon a strange advertisement of a fantastic resort on television at midnight. Sleepy as he was, he made a reservation even though he didn't even realize he was talking to the advertisement. The next day he discussed with the family their holiday plans, only to realize he could not find the place anywhere on earth. All of a sudden though, there was a suitcase in Nobita's room and intrigued as he was, he opened it only to find a portal to a beautiful resort managed by tin robots. Better still, it's absolutely free. However, it seems that there is a hidden agenda behind the person who invites them there.