Trainer,
We've received your request via the Help Center for your Pokémon GO account to be deleted. If you did not submit this request, don't worry: we won't process this request until we hear back from you confirming that you'd like us to take action.
If you're sure you'd like to completely and permanently delete your Pokémon GO account, please reply to this email with the words “DELETE” so that we can process your request. All game data associated with your account will be completely and permanently deleted. Note that you will not be able to reuse your nickname if you decide to create a new account in the future.
Account deletion requests currently take several weeks to review and process.
-NianticOps