To get to the Lost Cave in FireRed/LeafGreen, you must sail to Five Island, surf north through the Water Labyrinth, and then head east from Resort Gorgeous.
To reach Five Island, you must first obtain the Rainbow Pass from Celio after obtaining the National Pokédex, and then board the Seagallop Ferries in Vermilion City Port.
You can only reach the Lost Cave after the game. There are plenty of goodies in the cave, however, which means it’s worth making the journey once you’ve defeated the Elite Four and snagged the National Dex.
In particular, before you can reach the Lost Cave, you must do the following:
- Get Celio’s Tri-Pass after defeating Blaine
- Defeat the Elite Four
- Get Professor Oak’s National Pokédex (after catching 60 Pokémon)
- Get the Rainbow Pass from Celio on One Island
The Rainbow Pass is the most important thing here, as you need it to get to Five Island, where Lost Cave is located.
Unfortunately, you can’t get this pass until you beat the Elite Four and get the National Dex.
How to get to the lost cave
Once you have the Rainbow Pass, getting to the Lost Cave is pretty easy.
You must have a Pokemon that can Surf, but I’m assuming you’ve already checked that box at this point.
Step 1: Board the Seagallop Ferry and sail to Five Island.
Step 2: Once on Five Island, head north and surf the water maze to Resort Gorgeous.
Step 3: From Resort Gorgeous, sail east until you reach Lost Cave.
The Lost Cave is hard to miss. It will just be a tiny rock formation with an entrance in front of it just east of Resort Gorgeous.
How to navigate the lost cave
There are five items you can retrieve from the Lost Cave, but getting them is a mystery. If you take the ladder down into the cave you will meet the Ruin Maniac Lawson.
After defeating him, you can start the puzzle.
Each item has a specific set of instructions that you must follow in order to obtain them.
Just grab the “doors” in the specific order listed below for each item. Just make sure you always start from the same room as the Ruin Maniac.
Note: If you take the wrong door you will be right at the beginning of Lost Cave and will have to start over.
|Loose incense||East South|
|Incense from the sea||East, North, South, North|
|revive Max||East, North, South, South, East, East|
|Rare Candy||East, North, South, South, East, West, South, West|
|silk scarf||East, North, South, South, East, West, South, East, North|
When you first follow Silk Scarf instructions, you will save an NPC girl. After that, just go back to the Lost Cave and follow the directions for the Silk Scarf again.
https://www.fandomspot.com/pokemon-frlg-lost-cave/ Pokemon FRLG Lost Lair Location + Puzzle Guide – FandomSpot