In the other match, Queen City United routed Cebu State College of Science and Technology United FC, 2-0.
Experience played major role in Metropolitan's rampage with Ronald Loayon at the helm, showing off his offensive mastery by drilling in seven goals.
Loayon gave FC Inter Lapulapu's goalkeeper Ramil Baguio with so much work early on after he scored with just five minutes gone by in the first half.
George Doromal stepped on the gas 10 minutes later for Metropolitan's second goal. Loayon banged in goals at the 18th, 29th and 32nd, while Doromal struck his second contribution at the 41st for a 6-0 lead at the turn.
The inexperienced FC Inter Lapulapu was groping for form the rest of the way as it could not pierce through the solid defensive walls of Metropolitan.
As if scoring five goals at the half were not enough, Loayon sneaked in a goal a minute after the break before posting his last goal at the 49th.
Metropolitan's demolition job did not stop in there as it drew more goals from Ramie Colina the 52nd and 63rd, while Almi Colina and Dodong Ariola iced the blowout with goals at the 70th and 76th.
Also chipping in one goal each were Danilo Juezana at the 77th and Rosito Torre at the 86th.
On the other hand, Dexter Arojado scored QCU's two goals at the 51st and 59th to defeat CSCST in the main game.