I'm Super Mario Tier but when I connect to Wonder Trade on Pokemon ORAS, it gives me a service ended message

[MatthewL246_PNID]

This is now explained in the donation FAQ:

@GamersInternatio

At this time, whitelisting for testing servers is not automatic for 3DS consoles. To gain access to these servers, please request access with your 3DS Friend Code in either the #testing-discussion channel in the Discord server or in the 3DS Friend Code Whitelisting thread on the forum.