Arceus stared at the egg for a long time, dimly catching a glimpse of a different past from within it. This was deeply wrong.
You must understand that when life stands upon the river of time at this very moment, looking out from where he stood, the past should be immutable. There ought to be only one fixed existence, and all life standing at that exact same moment should, without exception, be the same.
To be able to glimpse a different past—Arceus could only think of the possibility of another parallel world crossing over into this one.
Chapter 278