The new DLC adds a fantastic method of getting tons of Watts really fast. This guide on How To Farm Watts In Sword & Shield Isle Of Armor explains a new method of obtaining Watts where you can have Digging Pa dig up some Watts for you in exchange for a new item introduced with Isle of Armor.
During your time exploring Isle of Armor you will find Armorite Ore. There are currently two known uses for Armorite Ore. You can trade it with an NPC in the Dojo in exchange for a new move for one of your Pokemon, or you can give them to Digging Pa.
How To Farm Watts In Sword & Shield Isle Of Armor
You will find Digging Pa here, in the Training Lowlands. You give him Armorite Ore and have him dig up Watts in return. The first time I spent 7 Armorite Ore he dug up 52,000 Watts. This is easily the fastest method to obtaining Watts, much quicker than checking dens.
This is also a fantastic way of purchasing Wishing Pieces so you can farm the new Ditto den.
Check out our guide on farming Armorite Ore
in Pokemon Isle Of Armor Guides