how to extract .pck and .dat files?

[simonrule]

Going to need a hell of a lot more information than that to even begin to help - for a start, knowing what the game is would be helpful...

sorry here u go the game's name is the seven deadly sins unjust sin
and i used this tool HackingToolkit3DS to exctrat the game cia file after i convert it from 3ds to cia