Kiteretsu Encyclopedia is a science fiction manga series by Fujiko F. Fujio which ran in the children's magazine Kodomo no Hikari from April 1974 through July 1977. The manga was later made into a 331-episode TV anime series which ran on Fuji TV from March 27, 1988 through June 9, 1996.
The main character is a scientific genius boy named Kiteretsu, who has built a companion robot named Korosuke. He frequently travels in time with his friends and Korosuke in the time machine he built. Miyoko is a girl in his neighborhood who is basically his girlfriend (though they are both in grade school).
There are many similarities in the makeup and appearance of the main cast to the cast of Doraemon, which was also created by Fujio, though the content of the story is completely different.
