Here's the card in question

Trinity Burst - St-424
Program, Activation: Battle Phase
"Add 100 to the attack power of your Megalo Growmon, Taomon and Rapidmon (perfect)"
"After raising their attack power, if you have all Digimon: Megalo Growmon, Taomon and Rapidmon (Perfect) in your digimon box, quintuple each of their attack powers"
"At the end of the turn after after the turn during which all three cards were gathered together, or when this card turns face up, stack this card onto your point gauge."

So my question is how is it possible to get three different perfect level digimon in your Digimon Box at the same time for this effect to trigger?