After you try to investigate the meteorite, Pokey tells you to go home.
Answer the Door
Go to the front door. There will be a cutscene. You have to answer Yes to proceed. Afterward, talk to Mom and you will automatically go back up to your room and change out of your jammies again.
Don't forget to equip the Cracked Bat. You can get it from the gift box in Tracy's room if you didn't do so earlier.
Go downstairs and talk to Tracy to get a Cookie. Then talk to your dog, and he will join you. After that, talk to Pokey, and he will join you. Try to go outside.
Talk to Dad
Answer the phone. Your Dad will tell you how to use your ATM card. He will automatically deposit cash in your account whenever you defeat an enemy.
After the phone call, you can call Dad again to ask him to save the game. Choose "Continue" if you want to keep playing for now.
Go to the Meteorite
Go outside. There are enemies in the area now, so be careful. You can see them moving around in the overworld, so you can try to avoid them, but you will miss out on earning EXP if you do.
If you and the enemy are facing each other when the enemy touches you, a black swirl will appear on screen, and the Speed stat determines who goes first. If you are facing away from the enemy when it touches you, a red swirl will appear on screen, and the enemy will go first. If the enemy is facing away from you when it touches you, a green swirl will appear on screen, and you go first. You can try to quickly change direction after the enemy touches you.
The Spiteful Crows in the area drop Cookies, but they also can steal from you. But it can be helpful to stock up on Cookies by killing the crows. If you run out of room in your bag, you can toss your Cookies to make room for items in gift boxes.
By the way, you will soon receive an item that you can't refuse, and this can be annoying because it takes up a space in Ness's inventory that could otherwise be used for more useful things. However, you can avoid this if Ness's backpack is full. If you want to fill up his backpack, fight crows now until your inventory is full of cookies.
Find Picky Near the Meteor
When you go toward the meteorite, your dog will get scared and run back home (but he will be OK). Walk past the meteor and talk to Picky. He will join you.
Meet Buzz Buzz
Go back the way you came. Pokey say that he can hear a bee buzzing around and asks if you can hear it. It doesn't matter what you answer. Afterward, Buzz Buzz joins you.
Go toward Picky and Pokey's house (next to your house). You won't encounter any enemies on the way. Just before you reach Pokey and Picky's house, you encounter Starman Jr.
This battle is impossible to lose. Buzz Buzz will keep a psychic shield around you at all times. You can turn on Auto Fight, or just keep attacking, or defending if you prefer, until the battle is over.
Afterward, go into Pokey and Picky's house and talk to their father. There will be a cutscene. Afterward, talk to Buzz Buzz, who tells you to go to Giant Step in Onett. He will give you the Sound Stone. However, as mentioned earlier, if your backpack is full, you won't get the Sound Stone. This will free up a spot in Ness's inventory, and the Sound Stone will still work, even though Ness isn't carrying it. Just don't ever talk to Tracy in person again unless your inventory is full, because otherwise she will give you the Sound Stone.