Here's why:
* Mewtwo is a Legendary Pokémon: Legendaries are known for their high catch rate, meaning they're harder to catch than regular Pokémon.
* Mewtwo is powerful: Its high stats and powerful moves make it tough to weaken before you can catch it.
* Mewtwo is rare: You're likely to encounter Mewtwo in special events or raids, where the catch rate might be adjusted.
To increase your chances of catching Mewtwo:
* Use your best Poke Balls: Premier Balls, Ultra Balls, and even Master Balls have higher catch rates.
* Weaken Mewtwo significantly: The lower its HP, the better your chances.
* Use berries: Razz Berries increase the catch rate, while Golden Razz Berries offer the biggest boost.
* Use a special catch rate modifier: Some events or raids offer boosted catch rates.
It's still a tough challenge, but with the right strategy and a bit of luck, you can catch Mewtwo!