The Arch, a.k.a. Archloha Stadium, is the heart of bouldering on Oahu and the go-to spot for hard roof climbing, with a number of power-endurance test-pieces, but also a handful of good moderates. It's unknown who the first people to climb here were. I know that Mike (3 Dog Mike) McGuire and friends top-roped it back in the early 2000s. I've seen a photo dated 2008 of someone bouldering (without a crash pad). It would appear that the first extensive bouldering development began with Justin Ridgely and friends in 2010. After a couple sessions, the first named problem, Pidgin Lessons (V3), was born, and soon after the classic Big Baby Buddha (V9) was put up by Jason Kehl during a trip to the Island.
A renaissance of development between 2011/12 saw weekly sessions (thanks in large part to Phil Langford and his Jeep), and the number of problems rapidly increase, with notable FAs at hands of Hiro Watanabe (Timy's Tic, ArchArchArch!, Cocaine in My Dick Vein), Matt Lutey (Rock Bottom), and others.
More recent outings have kept the list of problems growing, with a trend toward longer and harder -- Paul Robinson's Bottom Rock (V10) and Matt's Vana Pinata (V11) for example.
The Arch is by no means tapped out. There are still are many link ups and couple of hard projects that remain. Pray for dryness!