Kirby > Dark Meta Knight > Meta Knight > Hyness > Galacta Knight > Void Termina > (All the people who were killed by Void Termina)
Let me explain:
So Kirby's on the top, of course, since he's beaten every other person he's fought before. Dark Meta Knight is lower than Kirby but higher than Meta Knight, since he has bested Meta Knight in Amazing Mirror. Meta Knight has defeated Hyness (in Guest Star or as a Dream Friend). Hyness sealed away Galacta Knight. Galacta Knight sealed away Void Termina. And Void Termina killed a bunch of beings. These are ACCURATE since they all match up.