The Ultimate Horn in Leafgreen is not an item, it's a pokemon. Heracross. You can find him on island 6 in the paddock on left from the horn house.
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Nidorino Learns Horn Drill at level Level 53 but that is only in firered/leafgreen have you got a specific game?
There is no such TM called horn drill.
Horn drill is not a TM in diamond only in red and blue.
same thing
Unfortunately, Nidoking doesn't learn Horn Drill at all. In order to have your Nidoking learn Horn Drill, you'll need to level up your Nidorino to level 46 (you learn Horn Drill at that level) and then evolve it into a Nidoking.