Diamond Software

Diamond Software is a fictional company that's introduced in WarioWare: D.I.Y. They seem to be rivals of WarioWare Inc. They publish microgames like WarioWare Inc. and not only that, but they also publish comics and records. Mona, Jimmy T, Ashley, Orboulon, and 9-Volt had abandonned WarioWare Inc. to join this company.

Diamond Software is the one who published all of the starting microgames. You also receive records from them by doing small acheivements.