>>194837601st logical reason: They are downgrading their servers, due to lack of use and lack of funds.
2nd logical reason: They are in a dormant state until the X and Y hacking scene really takes off (which won't happen till the 3DS hacking scene takes off, which won't happen for another few years).
3rd logical reason: They are shutting down for good and that's just a placeholder until their contract with their web host is up.
4th extremely unlikely reason: They are working on 6th gen Pokecheck.