How to get Moonblast in Pokemon Scarlet

Moonblast isn't a TM you can just pick up while wandering around, nor is it a move that Pokemon learn naturally by leveling up in Pokemon Scarlet. Instead, you need to head over to the TM Machine once you have the recipe for it. You can unlock the Moonblast TM by defeating certain powerful Tera Raid Battles, which drop rare materials alongside the recipe for this coveted move. Once you have the materials and recipe, you can craft the TM at any TM Machine found in Pokemon Centers. So, get ready to raid if you want your Pokemon to pack this Fairy-type punch!

Actually, I've never had to craft Moonblast in Scarlet 'cause none of my squad needed it. But yep, Tera Raids are the way to go if you're looking for it.