How do you get the TM drill peck in Pokemon platinum?

In Pokémon Platinum, you can obtain the TM for Drill Peck by defeating the Gym Leader in the Veilstone City Gym, Maylene. After defeating her, you'll receive the TM60, which contains Drill Peck. Additionally, you can also find TM60 in the battle area after completing the Elite Four, specifically in the Battle Frontier's Battle Hall.