No, a Player ID is not required to retrieve your username or reset your password.
The simplest information to provide is the email address that is associated with your Pokémon Trainer Club account, which is required, and your date of birth. If you can accurately provide those, no other information is necessary.
The Player ID is primarily used for Play! Pokémon events such as leagues and tournaments.
For instructions on how to retrieve your username, see “I forgot my Pokémon Trainer Club username. How do I retrieve it?”
For instructions on how to reset your password, see “I forgot my Pokémon Trainer Club password. How do I reset it?”
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