* Mewtwo's Location: Mewtwo is found in Cerulean Cave, which is located on Cinnabar Island.
* Cinnabar Island Accessibility: Cinnabar Island is inaccessible until after you defeat the Elite Four and become Champion.
The only way to obtain Mewtwo before the Elite Four is through cheating or using glitches. These methods are considered unethical and can disrupt the game's intended balance.
Enjoy the journey and the challenge of obtaining Mewtwo the intended way!