How do I log into Pokemon Go if my Gmail account was deactivated?
Solution 1:
I know you have already contacted them but your best action would be to wait to hear back from Niantic support and see if they are able to restore the account data to a new G-Mail or Pokemon Go account.
Your best bet would be to find any receipts of any in game purchases you made, through PayPal, bank card purchases etc as they will have a transaction ID that they may be able to link with your account.
Without this they have no way to confirm you are the original owner of the deleted G-Mail account and will probably not restore said account.