If you only mean not using action replay, then use pokesav. If you mean no cheats, then I have to say, there is no really quick way of getting your Pokemon to lvl 100. The E4 are your best bet's. If your EV training, then keep EV training until you get to lvl 100. Hope this helped.
Action replay
No
no you have to get is from an action replay or go to a Pokemon event
you trade it or use action replay
U HAVE TO MIGRATE OR ACTION REPLAY
Not Possable
It is Impossible without an action replay
You can't without an action replay.
Missingno is not avalible in Pokemon Diamond without help of the Action Replay.
You can't get the Azure Flute without the Action Replay or event.
There is none.
you can't