It's in Farllabour Town...go to Fossil Maniacs house then talk to his little brother near the entrance to a cave..
Mewtwo can be obtained through trading from Fire Red or Leaf Green or by cheating
Mew is only in Emerald and he can be obtained through cheating aswell
Double Post Is Noy Permitted in SuperCheats
~Second Post Deleted~
Just A Bullet For My Valentine
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Special Thanks To Dark_Wolf_33 For The Great Sig