Following are the scripts that can be executed as sysdba in order to get the AWR, ASH and ADDM reports on Oracle RAC:

SQL script for getting AWR Report on RAC database:
SQL>@$ORACLE_HOME/rdbms/admin/awrgrpt.sql
SQL script for getting AWR Report for  single instance:
SQL>@$ORACLE_HOME/rdbms/admin/awrrpt.sql
SQL script for getting ASH Report on RAC database:
SQL>@$ORACLE_HOME/rdbms/admin/ashrpti.sql
SQL script for getting ASH Report for single Instance:
SQL>@$ORACLE_HOME/rdbms/admin/ashrpt.sql
SQL script for getting ADDM Report on RAC database:
SQL>@$ORACLE_HOME/rdbms/admin/addmrpti.sql
SQL script for getting ADDM Report for single instance:
SQL>@$ORACLE_HOME/rdbms/admin/addmrpt.sql