Go to one island. Go to mount ember. Find two rocket members. Beat them and go into the cave that will be there. Keep going until you find the ruby gem. Get out. Return to the poke centre on one island. Talk to Celio. He will give you a rainvow pass. Go to seven or six island (I can't remember which one). Go south. Find a guy who blocking the way. Now go to four island go to the cave there. Find the elite four member there. Defeat team rocket. Go back to the place where the guy was blocking the door. Use "Cut" on it and it should open. Go in. Tke the correct ways down to the sapphire gem. Then the professer will come in and take it. Then go to the rocket warehouse. Find (on the internet) out how to get to the professer. When you have done that you will vs. 2 or 3 rocket members. After that you will vs. the professer. If you defeat him he will give you the sapphire gem. Go back to Celio. He will thank you. Now go to cerulean cave and it should not be gaured. Hope this helps!
Go to One Island and, talk to Celio; finish the "quest" he gives you. After that, you have to beat the Elite Four again (they're much harder this time. Also, if Lorelei isn't there, you have to help her in Icefall Cave on Isle. 4). After you've defeated the Pokemon League for the second time, go back to the Cerulean Cave and the man should be gone; that's where Mewtwo is hidden.
you have to have helped celio on one island and beaten the elite four and champion gary...
You have to catch mewtwo
You must beat the Pokemon league.
You have to have beat the Elite 4.
hmm, it depends on what cave you're asking about; snorlax blocks a cave in an earlier version, but since you asked in FireRed, I assume you mean cerulean cave. In that case, you just need to beat the elite four and then it'll be open for you.
You have to defeat the elite four and after that it should be open
After you beat the elite four and rival, he is in cerulean cave on the west side of cerulean city, on the outside nugget bridge. You have to surf to get to the cave entrance and it won't be open unless you've beaten the elite four. Te cave is pretty long and has Pokemon levels 40-60s in it. Mewtwo is at the end of the cave/tunnel whatever and he'll be level seventy. I think he knows psychic swift recover and somethin else when you find him.
Well........... To get a shiny mewtwo you have to got to the cave where it is in then if you battle it get it's health low as possible with the false swipe Tm. Then wait a couple of hours with the DS OPEN not CLOSED then when you come back it will be shiny (green colour). This might work i heard it's 3/10 that it will work so 30%. Hope this helped!
You must defeat the Elite Four and then return there to defeat the two Rockets that are stationed outside.
hmm, it depends on what cave you're asking about; snorlax blocks a cave in an earlier version, but since you asked in FireRed, I assume you mean cerulean cave. In that case, you just need to beat the elite four and then it'll be open for you.
After beating the Elite Four and fixing the trading machine on Island 1, Cerulean Cave will be open. Head north past the Nugget Bridge, and to the left, Surf the water. You'll come to the Cave immediately. Mewtwo is on the path that you do notneed Rock Smash to get to.
use cut
You have to defeat the elite four and after that it should be open
You have to firs beat elite 4. The cave will open up in Cerulean. Enter the cave, use flash, and navigate your way through. Find MEWTWO and catch him. Cerulean cave is not available in Ruby, Sapphire, and Emerald.
When you beat the elite four (that's what I've heard.
After you beat the elite four and rival, he is in cerulean cave on the west side of cerulean city, on the outside nugget bridge. You have to surf to get to the cave entrance and it won't be open unless you've beaten the elite four. Te cave is pretty long and has Pokemon levels 40-60s in it. Mewtwo is at the end of the cave/tunnel whatever and he'll be level seventy. I think he knows psychic swift recover and somethin else when you find him.
it's on island one after you talk to the guy about the gem the two guies at the mountain they open a hole enter and it's in the cave.
Use Surf on Route 24 then go south you should see a huge cave that's cerulean cave if the cave isn't open you must beat the elite four.
after you beat the elite four go to island 1 and talk to celio.then go to mt. ember where the two team rockets are.That's where the ruby gem is.search 4,5,&6 islands for a building with bail on the door.use cut. then go up,left,right,down through the holes and find the sapphire.then go to the rocket warehouse on island 7.get the sapphire back.after that go back to celio and cearulean cave will be open and you can trade Pokemon with ruby and sapphire.Just finish the Team Rocket warehouse at 5 island and go to the cerulean cave and a guy here will let you go.
after you beat red it will be open and u can get mew2 good luck you will need it (and escape ropes)
mewtwo, from the cave near cerulean city, which is open to you only after you beat em also if u havnt been to sevii islands or snowfall cave you can go there for moltres and articuno sevii islands also lets you get lugia ho-oh and deoxys