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

Here is Why You Need An Adapter

The outlet and plug type used in Hong Kong is G 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

Hong Kong

In Hong Kong, outlets of type G are in use.

Type G