I see focus band as more of an ally. Mantine just rips through this deck, so I had to prepare myself (Hence the love metal energy and the 4 focus bands.)
Well, Gold berries are usable, but it's not woth the space. Plus, Since you can only attach one tool at a time, I'd feel more safe with a focus than a GB. There's alot of ways of OHKOing things, and gold berry can sometimes get in the way.