Zapdos

Zapdos is the second Legendary Bird Pokémon. It is both an Electric and a Flying type. Legend says that it lives in the thunderclouds; the flapping of its wings causes summer storms. Its flight is marked by distinct crackling and snapping sounds. It often appears from the clouds while blasting huge bolts of lightning; it gains power if it is stricken by lightning bolts. It has the Pressure ability, and its moves may include Roost, Discharge, Thunder, and Drill Peck.

Catching Zapdos
Zapdos is much like catching Articuno and Moltres.
 * In the Platinum version, talk to Professor Oak in Eterna City and he'll give you the Up-Grade and tell you the birds are roaming Sinnoh. Catch it by approaching it slowly on the water (with Surf) or tall grass. Chances are one of them will appear. It's best to use Max Repels before stepping into grass or surfing.