How many times does Lugia appear in surrounded sea Pokemon mystery dungeon explorers of time?

Answer 1

As many times as you can make it appear. Lugia won't dissopear from the floor unless you defeat it, and even then you can still just exit and re-enter the dungeon, get to the eighteenth floor, then find it again. It helps to have the item Golden Mask or Amber Tear when recruiting Lugia as your leader's held item as this raises the recruit chance by 25%. Lugia's recruit rate is also 25%, as is Ho-Oh's, but there are other items that help recruit Lugia other than Golden Mask or Amber Tear, these are Raquaza's Treasure (obtained by defeating Raquaza at the summit of Sky Stairs then finding it in the golden chest) and the Friend Bow (rises recruit chances by 10%.) Having all these items won't really make a difference as you need to hold them, and giving them to your team members won't help either, so you have to pick one. I'm sorry if you already know all this, but you said "in surrounded sea" so you must know where it is and how to get it. Lugia will never perminantley dissopear from the dungeon unless you recruit it so you can try as many times as you desire!