Toad Town Dojo
From the Super Mario Wiki
The Toad Town Dojo is a part of Toad Town featured only in Paper Mario. Here, Mario and the gang can practice their fighting skills against Chan (a Buzzy Beetle), Lee (a Duplighost) and The Master himself, a Toad martial artist. Each battle earns a harder challenge and recognition. In fact, this is the same as battling Jinx (and Jagger) in Super Mario RPG: Legend of the Seven Stars.
This is where Mario can earn the First, Second, Third and Fourth-Degree Cards as well as the Diploma. Despite the fact that Mario can face powerful optional bosses here, no reward (or even Star Points) is given other than the aforementioned cards and diploma, as the battles are just a challenge.
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