They ascend Mount Coronet to petition Dialga nearly daily, each with a different face and wishing to return to a different point in time. Some come out of regret, for they ruined their happiness, or their life, or the life of another, and wish to traverse time to stop themselves. Others are elderly or sick, and come out of nostalgia and the fear of death; if they must only have so many years on earth, could Dialga at least let them experience it in multiple ways? Most cry, and beg, and pray, and have Dialga to look upon their sorrows; a few, out of arrogance, determination, belief in their own talent, or genuine pokemon mastery, attempt to force its hand with advanced types of pokeball.
The steel dragon god indeed sends them back in time, but not nearly as far as they wanted. Those who make the pilgrimage to Spear Pillar typically find it ending with a loud roar, then awaken not long before they began their journey. Dialga will not grant their true wish, even when it sympathizes, for it knows how much travel into the past can damage the fabric of reality. Instead, it blasts them a short distance, so as to at least not cause them to waste their finite time. Dialga has made exceptions in the past, in timelines only it knows, but only when the cause of those regrets imperiled the world itself.
There are a few who come to Dialga with the opposite wish: to travel into the future. Some are great rulers or scientists, wishing to see where their deeds will lead humanity; others are science fiction enthusiasts, or curious and bored by their own era. Dialga is a kind pokemon, and faced with no paradox, grants these wishes without fail.