Does Pksm Work with Virtual Console?

Will you add support for the Virtual Console games? ... There are currently no plans to support the Generation 1 and 2 Virtual Console games, but PKSM is an open-source project and you are more than welcome to work on their implementation yourself and submit a pull request.

Does PKSM work with DS games?

It can't edit saves for the ds games yet. The only thing you can do is add mystery gifts and use scripts (if you have any added.)

How do I know if my PKSM is legal?

Legality checking can be performed in the editor option of PKSM. A copy of the pokemon you want to check will be sent wirelessly to the server running on your PC and it will show basic or detailed legality infos.