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

Here is Why You Need An Adapter

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

Bolivia

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

Type A

Type C

Tuvalu

In Tuvalu, outlets of type I are in use.

Type I