COLUMN PDB_ID FORMAT 999
COLUMN PDB_NAME FORMAT A8
COLUMN FILE_ID FORMAT 9999
COLUMN TABLESPACE_NAME FORMAT A10
COLUMN FILE_NAME FORMAT A45

SELECT p.PDB_ID, p.PDB_NAME, d.FILE_ID, d.TABLESPACE_NAME, d.FILE_NAME
  FROM DBA_PDBS p, CDB_DATA_FILES d
  WHERE p.PDB_ID = d.CON_ID
  ORDER BY p.PDB_ID;


Sample output:

PDB_ID PDB_NAME FILE_ID TABLESPACE FILE_NAME
------ -------- ------- ---------- ---------------------------------------------
     2 PDB$SEED       6 SYSAUX     /disk1/oracle/dbs/pdbseed/cdb1_ax.f
     2 PDB$SEED       5 SYSTEM     /disk1/oracle/dbs/pdbseed/cdb1_db.f
     3 HRPDB          9 SYSAUX     /disk1/oracle/dbs/hrpdb/hrpdb_ax.f
     3 HRPDB          8 SYSTEM     /disk1/oracle/dbs/hrpdb/hrpdb_db.f
     3 HRPDB         13 USER       /disk1/oracle/dbs/hrpdb/hrpdb_usr.dbf
     4 SALESPDB      15 SYSTEM     /disk1/oracle/dbs/salespdb/salespdb_db.f
     4 SALESPDB      16 SYSAUX     /disk1/oracle/dbs/salespdb/salespdb_ax.f
     4 SALESPDB      18 USER       /disk1/oracle/dbs/salespdb/salespdb_usr.dbf

https://docs.oracle.com/database/121/ADMIN/cdb_mon.htm#ADMIN13939

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