after you beat red it will be open and u can get mew2
good luck you will need it (and escape ropes)
Chat with our AI personalities
at the cerulean cave
it s found on the first floor of cerulean cave.
You get it from The Power plant use your item finder thing its by where you catch Zapdos.in cerulean cave
The Odd Incense can be found in the Cerulean Cave along with Mewtwo himself.
After defeating all 8 kanto gyms, go in the cerulean cave. Search everywhere and you will find it.