Dragon Quest Monsters: Joker. Metal slimes may first appear on Celeste Isle, where the hunter mechs hint to their residence on the island. They can also show up on Fert Isle. However, “yellow-bellies” will not appear on the overworld in any of these instances. The metal menagerie on Palaish Isle is the only place where metal slimes can be seen…
Trodain – go to the royal hunting ground where you’ll spot a house. There’s a pathway west from where you’re standing. Zoom into the map and head towards a large clump of trees where the Liquid Metal Slime will spawn. There’s also another part of that same area where you head to the waterfall and have Yangus whistle for it.
The Metal Slimes have a higher probability of spawn at night. The area is near where you picked up the Flaming Boomerang. Near the Tower of Lydon (where Overlord Ono is) – different slimes spawn around the area. In this case, the Metal Slime doesn’t spawn too much here.