Read more about Guilmon at: Wikipedia

Official Site: Toei Animation

Digimon Tamers, produced by Toei Animation and written by Chiaki J. Konaka as the third series in the Digimon franchise, is centered on the Digimon Tamers, a group of children partnered with a wild Digimon. The characters were designed by Katsuyoshi Nakatsuru and was based on the concept of "a normal elementary school student has a great adventure over the span of a year." Producer Hiromi Seki had wanted the three main characters to be of mixed genders and consist of an immigrant or someone not raised in Japan.

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:Takato is a 10 year old student. His parents run their own bakery. Takato plays card games with his friends and draws his own Digimon on a paper. After finding a Blue Card, he uses it on the Digivice to create Guilmon. Learning that Digimon are mysteriously appearing in their world, Takato joins the battle. Because Guilmon was a product of his imagination, Takato appears to emphatic with him and thus the two influence each other in every fights. Their bond is augmented when Takato biomerges with Guilmon into Gallantmon. Takato becomes the leader of the organization. He also appeared in Digimon Fusion.

Guilmon has not been a contender in any CBUB matches.