The correct answer is option 3: Agulhas current. The Agulhas current is not a current of the Pacific Ocean, but rather a current located in the southern Indian Ocean.

To understand the other options, let`s take a look at each one:

1. Oyashio current: This is a cold current that flows southwards along the northeastern coast of Japan. It is an important ocean current of the Pacific Ocean and influences the climate and marine life in the region.

2. Alaska current: Also known as the Alaska Coastal Current, it is a warm current that flows northwards along the western coast of North America. It is part of the larger North Pacific Gyre and plays a significant role in the climate and ecosystem of the region.

4. California current: This is a cold current that flows southwards along the western coast of North America, from British Columbia to Baja California. It is another important current of the Pacific Ocean and affects the climate, marine life, and coastal ecosystems of the region.

In summary, option 3 (Agulhas current) is not a current of the Pacific Ocean.