El Gutso

is a Rank D Fire-attribute Yo-kai of the Brave tribe.

The Yo-kai Medallium bio reads; "A Yo-kai who's always challenging others to hardcore battles with no weapons or time limit. Winning or losing doesn't matter anymore... what matters the most is he brings his best game!"

Gachin-kozo evolves into Tenma-muso starting at level 35.

Quotes

 * Befriended: "I did lose this hardcore battle, but... now that we traded blows, we're already friends, right?!"

Name Origin
"Gachin-kozō" is a combination of gachinko (ガチンコ, "hardcore/earnest competition") and kozō (小僧, "youngster").