I need your help to find a font

[Kosheh]

The one used at the bottom of the screen, where it says "Play various modes blah-blah"

I need it in True Type for my fan-game.

Chances are that font's from Fontworks, a Japanese company that specializes in commercial fonts. Nintendo's one of their biggest clients.
Scrolling through the fonts, you might recognize the IntiCreates logo font, the Paper Mario font, etc...

http://fontworks.co.jp/

I forget the actual font name - I believe it's Skip Bold.
Unfortunately, that also means that the font costs about $1500 to purchase...

There's samples of the fonts on the site in PDF format. I don't know if it's possible to rip the fonts, and if so, the legality of that.