With a catch rate of 25, Mantyke is third only to the Beldum evolutionary family and Volcarona as the most difficult non-legendary to catch. This makes it more difficult to capture than Dialga or Palkia (25 in comparison to 30).
Why did they do this?
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"A delayed game is eventually good, but a rushed game is forever bad." -Shigeru Miyamoto
The more I know about people, the more I like my dog.