Bonding can be brought up in three diffrent ways.
One way is to use items such as the Tamagotchi King DVD 34 times, using it 34 times will add 10% to you bonding percentage. Here is a link to a post on this forum that has the codes to get these bonding raising items for free:
https://www.tamatalk.com/IB/index.php?showt...0entry1847745
Another way is training. When your tamagotchi calls you at certrain times of the day at times like 3:00, 2:00 etc go to the first icon on the bottom row of you tamagotchis screen and pick a bonding activity. Training adds 10% to your bonding percentage.
The third way can only be used if your tama family is at generation 2 or more. When you are at generation 2 or higher the games called "Golf Putt" and "Shoe Pair" will be open for you to play. These games raise your bonding depending on how high you score.