The King of Braves: GaoGaiGar

In the year 2005, a race of alien monsters called Zonders emerge from underground and launch a series of attacks on the city of Tokyo. The only defense against these creatures is the secret agency known as the Gutsy Geoid Guard (or 3G) and their ultimate weapon, the awesome giant robot GaoGaiGar. GaoGaiGar's pilot, Guy Shishio, is a former astronaut who was nearly killed two years before when the Zonders first crashed to earth. Guy's life was spared when a mysterious robot lion called Galeon pulled him from the burning shuttle and brought him to Earth. Guy's father, Leo, then used Galeon's technology to rebuild his shattered son as a cyborg, in the hopes that he could stop the aliens when they appear. Now, with Galeon as its core, GaoGaiGar fights to protect Earth. He is aided by a team of transforming robots and by a young boy named Mamoru, who has the power to purify the Zonders' cores, and seems to be connected to the mysterious Galeon. (Source: Anime News Network)

Mado King Granzort

In the future, the moon is a habitable place with atmosphere and gravity and also a famous tourist attraction. There are also stories about a "long ears" creature like rabbits on the moon who can use magic. Haruka Daichi heads off to the moon during a summer holiday alone because he likes to see the long ears creature by himself. However, he get himself dragged into an acient conflict between two acient moon racess: the "long ears" race and Jado race. Jado race wanted to conquer the universe and resurrect ancient evil powers to seize control of the Earth. Now the "long ears" race and Daichi must seek three warriors who could use magic to release Mado King to fight Jado race and to release "long ears" race`s kingdom, Rabiluna, from Jado race. (Source: AniDB)