I don't know if this question has been asked before but I like to ask how do you all know about all the Pokemon max stats, chances of meeting a wild pokemon and even how to get Arceus even though you say Nintendo has not released any events about that. Sorry for asking this but I am just curious about it.

The data is all sitting there in the ROMs. All you have to do is know how to read it.

And no, we don't have a magic program so that you can easily read all the information yourself.