Make sure you are not confusing the character’s name with account username, they are different and you might have used a different name for both.
If you don't remember if you have other accounts or don't remember one of your credentials, you can use the links below to recover them:
If you also don't remember or don't have access to the email you registered in the account, unfortunately we won't be able to help. To recover your account, you must have its credentials or access to the email.
If you have the account's credentials and need to change the email, use the form on https://pokemmo.com/account_change_email/ if you still have access to the old email or contact us on Support Requests > Email Issue if you don't have access to it.