Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-27330113-20160807182635

They're lot of unused things in the game files, so if the DATA stats are there, that means nothing.

Also, I already said, DATA is for game mechanics (Damage that they receive or deal), CHECK is for compare how stronger monsters are between them (For example: Undyne has 50 ATK compared to Mettaton EX's 47, therefore, Udyne is sightly stronger than EX)