Guly do Prado scored a nine minute hat-trick as Saints handed out a pre-season thumping to Spanish minnows Palamos.
Pochettino made nine changes at half time and would have been delighted that both teams were so dominant.
The second half side were not to be outdone though with Do Prado leading the way in impressive fashion.
Jay Rodriguez made it 4-0 from the penalty spot on the hour mark before the Brazilian started his scoring spree, completing his hat-trick in the space of just nine minutes.
Luke Shaw rounded off the scoring with five minutes remaining.
Saints first half: Boruc, Chambers, Fonte, Lovren, Fox, Cork, Schneiderlin, Lallana, Isgrove, Puncheon, Lambert.
Saints second half: Gazzaniga, Clyne, Fonte (Stephens 66), Hooiveld, Shaw, Wanyama, Schneiderlin (Isgrove 66, Turnbull 82), S Davis, Ward-Prowse, Do Prado, Rodriguez.