Max is a roaming NPC in eastern Varrock — he cycles between a bank, anvil, fire and spinning wheel. Elen Anterth in the Max Guild (Prifddinas) is a fixed, easier alternative once unlocked.
Temporary boosts don't count every skill needs a genuine, unboosted level 99 — there's no way to buy the cape with a boosted stat.
Dungeoneering exceeds 99 naturally if you're working toward Master Max Cape too, levelling Dungeoneering past 99 on the way there is completely normal and doesn't block the standard Max Cape.
Buying isn't a separate requirement once every skill above reads 99, purchase from Max or Elen Anterth for 2,871,000 coins — it's just claiming the reward, not something to grind toward.
Track your Max Cape progress
Sync your RuneScape name and check off every requirement above — free, no account needed.