The Focusing Stone first appears as a Meteor that crashes at the Pack-A-Punch temple, at the end of the easter egg you use the upgraded "Baby Gun" to shoot a few magic orbs, after that the orbs shrink the Focusing Stone down to a size to fit in your pocket. Then you use Garys Dynamite to blow up the door, that releases Brock & Gary from The Past.
You then go up to where the Pack-A-Punch would be and instead you will find the Focusing Stone.
- Only 1 Player can hold the Focusing Stone, but everybody will get the Time Travel Will Tell Achievement/Trophy.
- Like in the Golden Rod from Call of the Dead, whoever grabs the Focusing Stone is actually seen holding it the rest of the game.