You have to unlock Silver Trench, which is 99 floors. I suggest taking lots of huge apples, friend bow, and X-ray Specs. You have to go to the 99th floor and Lugia should be there. Its easier if you have a friend bow, and are level 100.
Floor 99f in silver trench. High recruitment rate.
keep on beating it till it joins
No, you can not get Lucario in Mystery Dungeon Blue.
go to silver trench first then get lugia to join your team then meteor cave will be unlocked
after Befriending Lugia Meteor cave will open up.
you get it by entering meteor cave, which is found by blastoise the next morning after recruiting lugia
you can't trade on Pokemon mystery dungeon OK
Yes there is a unknown dungeon in Pokemon blue mystery dungeon! You'll have to connect with your friends if you want to go there
99
buy it.
If you are talking about Pokemon mystery dungeon red rescue team or Pokemon mystery dungeon blue rescue team then: Talk to alakazam, he'll mention something about the 3 great birds. once you go to them they will give you a stone which allows you into a new dungeon which has lugia.
Yes it is. I have Lugia myself. Here are the games you can get him in. Pokemon Fire Red/Leaf Green Pokemon Emerald Pokemon Mystery Dungeon Blue/Red Rescue Team Pokemon Mystery Dungeon Adventures of Time/Darkness Pokemon XD: Gale of Darkness Pokemon Diamond/Pearl Pokemon Battle Revolution I think there are other game but these are the only games I know you can get him in.