I've been trying to get it in fighting type raid dens, but no luck. If you know how, please tell me.
Thanks!
If this Pokemon learn Close Combat by earlier lvl you can go to move reminder, and if higher you can try in Max Raid battles to earn Exp. Candies and chance to drop TR 53 (list under) You can also check daily all Watt Traders.
Max Raid Battles with chance to drop Close Combat in both games: Rolling Fields, South Lake Miloch, Stony Wilderness
Max Raid Battles witch chance to drop TR 53 Exclusive for Sword: Dusty Bowl North Lake Miloch
On Bubapedia is list of dens and drops on all this locations: Dusty Bowl: https://bulbapedia.bulbagarden.net/wiki/Dusty_Bowl/Dens North Lake Miloch: https://bulbapedia.bulbagarden.net/wiki/North_Lake_Miloch/Dens Rolling Fields: https://bulbapedia.bulbagarden.net/wiki/Rolling_Fields/Dens South Lake Miloth: https://bulbapedia.bulbagarden.net/wiki/South_Lake_Miloch/Dens Stony Wildness: https://bulbapedia.bulbagarden.net/wiki/Stony_Wilderness/Dens
Soruce: Bulbapedia