Beat the elite four.
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)
Go through the cave.
It is found in Cerulean Cave. You will have to beat the elite four first. Then you must go to Cerulean city, pass the nugget bridge and use surf in the water to the immediate left. Follow the path down left and then you will be at the cave entrance. After some sleuthing, you will know which way to go to get to the deepest part of the cave, where Mewtwo waits.
You need the Rainbow Pass By getting this item you will be allowed to get into Cerulean Cave and be able to go to Islands 1-7 To get this item you have
In Pokémon HeartGold, you can gain entry into Cerulean Cave once you've defeated Blue.
you have to beat the elite 4 then get the rainbow pass from bill to go to islands 4 5 6 7 8 . loreli is on one of those islands. find her and save her then you can enter cerulean cave and catch mewtwo.
Celadon City, but you must go via Cerulean -> Rock Tunnel -> Lavender -> Lavender to Celadon by pass.
In Cerulean, there is a old man who wishes to trade a Poliwhirl for a Jynx. After trading, (you will have needed to have beaten the Elite 4 and have gotten the Rainbow pass from Oak) travel to Four Island and breed Jynx with a ditto (route 15 & cerulean cave) and whala. Smoochum.Breed Jynx with Ditto at the four island daycare hatch the egg to get smoochum.
you can get it at the house where you can see after you pass the digglet's cave but you need to trade it for a abra
you have to get a national dex by searching for all the pokemon.
To get waterfall, get the rainbow pass, and go to four island. At the end of Icefall Cave, you will find waterfall.
By going from Pewter City to Cerulean City, you just hop off the ledge. From Cerulean City to Pewter City, you can't. You have to go around and into Diglett's Cave.