Power Gauge

The Power Gauge appears in the shape of a flower on each Hero's uniform. The gauge is filled up every time a Hero deals enough damage, or blocks a strong attack. Once the Power Gauge is filled, it will automatically activate the Bloombot form.

Though it is stated that the Power Gauge is only filled by fighting, towards the end of the series it can be noted that if the will to fight and protect is strong enough, the gauge can be filled almost immediately and be activated.