It's inland (east) from Slurry Coast.
They are East of Dourbridge.
East of Dourbridge is Hieghts of Loneliness
Outside the heights of Loneliness. This is East of Dourbridge and North of Bloomingdale on the left side
Rampages, which are found around Dourbridge, or you can buy it at Batsureg.
(Possible spoiler) folow the path south from the dourbridge region
He is in the big tent in the north-east corner of Dourbridge.
Dourbridge is a location in "Dragon Quest XI: Echoes of an Elusive Age." It is a small village situated in the northeastern part of the game's world, near the banks of the river that runs through the region. Players can visit Dourbridge to interact with its NPCs, gather information, and find side quests. The village also serves as a waypoint for players exploring the surrounding areas.
It's part of the main quest so can't really be missed. You have to complete the plot related quests at Porth Llaffan first, until a ferry service is opened. This ferry will take you to Slurry Quay, and Dourbridge is only a short distance East from there.
If you've reached Dourbridge, the Heights of Lonliness are atop the nearby mountains. You will see a cottage at the base.
Slurry Quay is the little docking area west of Dourbridge, you are taken there when you are done at Port Llafan.
Aquila is your teacher in Dragon Quest 9.
That doesn't sound right, your copy of the game might be corrupt. See if you can take it back for a replacement.