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After debating with myself, I decided to test the water of the gym by fighting the Trainers inside and since I defeated them with relative ease, I hardened myself and challenged Brawly. Turns out it went well even though he used two potion; Ruru confused his Machop, but had to be switched out for second round, as Jem's bite dealt with his buff spamming Meditite. Last round was a Makuhita so I switched back Ruru as I knew from cave fighting psychic attack was its weakness.
He told me I could use Flash outside battle but I won't because I never liked this move, so I'm left to wander inside Granite cave in the dark. Hopefully I don't get too lost.