You can catch Mewtwo At celduran cave after you get all 16 gym badges
he is in a cave across from cerulean city (Kanto), a green haired ace trainer is guarding it
mewto
You can catch MEWTWO ,not Mewto, at the end of Cerulean cave
Moltres articuno zapdos raikou entei suicun rayquaza groudon kyogre ho oh and lugia and mewto and palkia dialga giratina and last but not least powerful legendary of all arceusgroudon
I don't really know but i think you have to have an Action Replay to get mewto lr you have to transfer it from an older Pokemon
action replay
Unfortuenetly u cant catch mewto on emerald only on fire red.green and dimond and pearl! SORRY SUCKERS!!!!!!!
no
PIKACHU
Yes
trade it
To delete a game file for any game, you need to press Up on the control pad, then Select, then the B button. But if you've got mewto or anything else good trade it with a freind and when you make a new file trade back.