Hello,
We've received your request via the Help Center for a Pokémon GO account to be deleted tied to this email address. If you did not submit this request, don't worry: we won't process this request unless you respond to this email.
If you'd like to permanently delete your Pokémon GO account, please copy and paste the following code into your reply: D31373M3
All game data associated with your account will be completely and permanently deleted. Note that you will not be able to reuse your nickname or email address if you decide to create a new account in the future.
Please note that once you confirm an account deletion, it won't be possible to cancel the request.
-NianticOps