On route 103 by mauville and slateport. Hope this helps
You have to beat elite 4 to get into Mewtwos cave
in cerulean cave in cerulean city after defeating the elite 4. and finding the ice type trainer of the elite 4 on 4 island in the lost cave. you have to get a rainbow pass to get to 4-7 islands . 1. defeat elite 4. 2. get rainbow pass. 3. go to 4 island. 5. go to lost cave. ( get passed the cave's mase like puzzle)
You have to beat the elite 4.
you get into the cave only by beating the elite 4 and getting the national dex
Complete the elite 4 at least once
beat the kanto elite 4
You Have To Beat The Elite 4 First,Which Is Hard.Once You Beat The Elite 4,The Guard Is Next To The Entrence To Cerulean Cave,And Your On The Road To Getting Mewto! YOU NEED TO BEAT ELITE FOUR.. AND HAVE 60 POKE's TO OBTAIN NATIONAL POKEDEX... AND POPPED>.!! THE GUARD WILL BE NEXT TO THE ENTRANCE OF THE CAVE..
No. All you have to do is beat the Elite 4.
yes it should be
you have to beat the elite 4
Get the national dex and beat the elite 4.
Just past victory cave