The black is an emulator glitch.
He was my last pokemon. I later went back and found out that hariyama completely breaks the elite four in emerald. It is gentle and not ev-trained, and with no item at lvl 54 it could solo the entire elite four and champion. It is, unfortunately, a complete carry pokemon, relying on arm thrust until you get dive. Then it quickly turns into a monster, as you pick up vital tms to compliment its godly stats. My strategy for the elite four was to belly drum at the first turn, which left me with 120ish hp, then hyper potion, then kill everybody.
moveset: brick break, earthquake, strength, belly drum.
Also, I should mention my way of taking out tate and liza, which often give people trouble. I found out that even though a Hariyama trained from a Makuhita does't have fake out, it can be relearned with a heart scale. I led with Manectrike (which I was incredibly lucky to get, with a modest nature) and Hariyama. I fake-outed the claydol, while manectrike ohko'd Xatu with thunderbolt. Then I doubleswitched to swellow and pelliper, and surfed the rest to death.