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 to your Pokémon Trainer Club account, which is required, and your date of birth. If you can accurately provide those, no other information is necessary.
A Player ID is primarily used for Play! Pokémon events such as leagues and tournaments.
For instructions on how to retrieve your user name, see “I forgot my Pokémon Trainer Club user name. 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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