You Do Need power plug adapter while traveling from Pitcairn Islands to Bolivia.

Here is Why You Need An Adapter

The outlet and plug type used in Bolivia are A and C and in Pitcairn Islands is I. This is how they look like.

Pitcairn Islands

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

Type I

Bolivia

In Bolivia, outlets of type A and C are in use.

Type A

Type C