To become a registered psychologist in Aotearoa New Zealand, you need to hold a Master’s degree (or higher) in psychology, complete 1,500 hours of closely supervised practice, and be registered with the New Zealand Psychologists Board.
You can find more detailed information on their website: https://psychologistsboard.org.nz.
The New Zealand Psychological Society may also be a helpful resource: https://www.psychology.org.nz.