The Brave of Gold Goldran

 is a Japanese anime television series begun in 1995, created by Takara and Sunrise under the direction of Shinji Takamatsu, and was the sixth in the "Yūsha"/"Brave" metaseries. Goldran follows the adventures of three young boys who are tasked with finding alien robot fighters, or Braves, that are sleeping in the form of crystals. Their major antagonist is the flamboyant and thoroughly incompetent Walter, and the villains that follow him are often similarly humorous. The entire show is extremely focused on comedy and silliness almost to the exclusion of much in the way of storytelling, although the series does develop some running plot lines towards its end. In terms of television ratings, Goldran was the peak of the Brave series' popularity.
Plot.
Three boys, Takuya, Kazuki, and Dai are from Ishinowa elementary school in the sixth grade. They are actively a strong, curious, mischievous trio. They obtained a mysterious jewel's "Power Stone". They bring back Dran, the golden robot, a brave who slept within a Power Stone and they became his master. However, Prince Walter Walzac, who aims at the Power Stone, has attacked them. They then go to an adventure for searching eight Power Stones that were scattered all over the world. They now aim at El Dorado's Legendra with Goldran.
The Braves.
The mecha themselves, called "Braves", were created by prolific mechanical designer Kunio Okawara. While some of the Braves transform into transportation (e.g. cars and trains), others transform into animals (e.g. tyrannosaurus and shark). Goldran itself is formed from Dran (a car) and Golgon (a tyrannosaurus). The Braves themselves are aliens from planet in the Golden Galaxy created by . If the Braves are defeated or their masters are killed they will revert into Power Stones, indestructible gems that can only reactivate them by reciting an ancient incantation. When not in combat the Braves can regenerate from any wound they received.