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With RTC available, raids respawn every day at 12:00am, iirc. You can grind raids by changing the time on your system, so that they'll respawn.
As for Macho Brace, it gives x4 EVs in this game, so it's intended.
If you're past Sabrina, you could use a Frisk mon with Thief and steal Lucky Eggs from wild Pelippers on Route 14. They sell for the same amount and are a lot more common.
Alternatively, you could grind raids and sell the items from it.
Just finished this game with this Gen-8 themed team. It made me appreciate the value of walls and tanks.
Corsola-G was amazing. It neuters just about any physical attacker and ended up soloing Bruno. Definitely MVP of the run.
I came across what seems to be a bug though. Cramorant's Gulp...