These items are all used to make your monster stronger while Training. They must be bought from a peddler (or in some games, a Gadget Shop) and placed on your ranch and provide alternate ways of raising your monster's stats. By training a monster with a gadget, the monster's results will increase, but its Fatigue and hunger will be affected also. Some gadgets will also cause a monster's stats to decrease or multiple stats to increase at once.
There are also special gadgets that effect your monsters in different ways. These gadgets are called Effect Gadgets.
Use of Training Gadgets has become popular in recent years, especially in Torble. Originally, they were devices used in ancient civilizations, but with the successful decoding of ancient gadget blueprints at Torble University, these devices have been recovered. With the help of Training Gadgets, it has become unnecessary to send monsters to far training grounds. But on the down side, the use of Training Gadgets in place of direct attention has led to a decrease in monsters' bond with their breeders. -"Training Gadgets" MR4