Here's a quick tip.
The Pokemon Global Link website requires referrers despite not listing that requirement in their System Requirements page.
Although the Firefox browser doesn't meet their system requirements to being with, that browser loads the Pokemon Global Link website fine... but its referrer add-ons can stop that website from loading.
The most popular Firefox referrer add-on is RefControl. If you're using that add-on you can allow referrers by following these steps:
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Load your regions Pokemon Global Link website.
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Right click on your screen and click on the RefControl Options for This Site option.
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Check the Normal - send the actual referrer bubble and click the OK button.
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Refresh your regions Pokemon Global Link website.