Each depowered teammate has a 20-25% chance to produce a plus. When transferring power to a teammate of the same attribute, the chance of that depowered teammate producing a plus doubles. Each type of teammate always produces a plus in the same stat, shown in the charts below. Depowering a teammate with pluses causes those pluses to be transferred to the teammate being powered up. For this reason, it's recommended to depower a teammate for their pluses to another teammate of the same attribute, then with the accumulated pluses, to power up yet another teammate that may not necessarily share the same attribute type. For example, if the player depowers many Goombas for their ATK pluses to a Wiggler (both allies wood-types), then transfers those pluses to a different attribute teammate - such as a Cheep Chomp, a water-type ally - by depowering the Wiggler, the Cheep Chomp would receive roughly double the pluses than they would if the player directly depowers the Goombas for them. Using this method, the player can strengthen allies where their stats may be lacking (i.e. using HP pluses to raise a teammate's low HP).
This page lists which teammates produce which plus stats for other teammates being powered up.
This section is under construction. Therefore, please excuse its informal appearance while it is being worked on. We hope to have it completed as soon as possible.