Training Machine

The Training Machine is an item from Super Paper Mario. It is a 2-screened handheld that resembles a Nintendo DS. Mario received it from Bestovius to deliver to Merluvlee, after giving Bestovius the "You-Know-What".

Upon giving it to Merluvlee, Mario questions which body part Merluvlee would use it to train, and Merluvlee cheerfully replies that she trains her brain, which is a reference to  Brain Age.

Apparently, the Training Machine is an old model; Bestovius claims to have a newer, slimmer version (likely a reference to the Nintendo DS Lite).