Cerulean cave located near cerulean city.
u have to finsh game and go to Diglet cave at the end
The rare Pokemon in the leafgreen and firered games are Mewtoo one of the legendary dogs from silver and gold depending on who you start with, moltres zapdos and articuno.
you can find groudon, mew, mewtoo, rayquaza, kyogre...
mewtoo latias darkrai latios dialga palkia
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
There is no Pokemon convention in firered.
hes not mewtoo and rushiram is better
you find the sihny ston in mewtoo's cave
In Celedon Cave. You have to beat the Elite Four and did the mission Celo{i think that is his name} gave you and finish it ...PS Celo is in One Island
you can find mewtwo in cerulean cave, just make sure you have a master ball it will make it so much easier to catch him.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
pikachu was the first Pokemon to be created along with all the legandarys such as mew, mewtoo, kiogre and groudon