Hi ,
You can use SQL Server Integration Services(SSIS) For this Migration of Data from both database in sql2000 & IBM db2.
for sql 2000 it will be easier to migrate.
but for IBMDB2 you need to take care during data conversions...
Hope discussion on this link will help you
migration-from-db2-to-sql-server?forum=sqlservermigration
let me know if you have still any query.
Regards
Mubin