Did Brazil Move Its Capital to the Highlands?

No. Brazil's capital, Brasília (since 1960), is on the Central Plateau at ~1,000 m (3,280 ft) elevation—moderate, not highland. The former capital, Rio de Janeiro, is coastal at sea level. Neither is a "highland" city in the Andean sense (e.g., La Paz, Quito). The move aimed to develop the interior, not gain altitude.