You Do Need power plug adapter while traveling from Côte d'Ivoire (Ivory Coast) to Pitcairn Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Pitcairn Islands is I and in Côte d'Ivoire (Ivory Coast) are C and E. This is how they look like.

Côte d'Ivoire (Ivory Coast)

In Côte d'Ivoire (Ivory Coast), outlets of type C and E are in use.

Type C

Type E

Pitcairn Islands

In Pitcairn Islands, outlets of type I are in use.

Type I