When you first capture it it's moves are: Thunder Wave, Drill Peck, Detect, Agility. If you got rid of drill peck simply find the move tutor on Two Island give him mushrooms and you will be able to reteach Drill Peck.
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you cannot get the tm but you can find the move drill peck with zapdos
zapdos can learn peck, Thundershock ,thunder wave,detect, pluck, Ancientpower, charge ,agility ,drill peck ,thunder, discharge, roost, ligth screen, and rain dance
Drill Peck and Thundershock
It should learn Drill Peck at around level 58.
It'll learn Drill Peck at level 47.