First you must gain enough experience with the Tool to be able to upgrade it.
You gain experience by using the Tool many times.
Once your Tool is experience enough to be upgraded use the Phone in your house to call the Blacksmith.
You will need money and an Ore. You get Ores from breaking rocks in the Mines.
Once you have the correct Ore it will take a few days for your Tool to be upgraded.
Gray will deliver it to your house once it is completed.
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Mythic is the best.
yes you can
You buy the upgrade from Gannon's shop.
You have to call Saibara the Blacksmith by going over to the phone in your house. But before you do this you have to have obtained ores from the mine. Hope this helps. :)
No