Well, sort of. You can go to your system settings and change the date to one day ahead to keep getting more Pokemon and expanding your ranch, but there is no actual hack or cheat to help you in the game.
You can't, you must trade from Emerald (which had an event to get to Mew), or trade from Pokemon Ranch (if you unlocked it).
If you have log cabin ranch then you can receive Mew from Hayley(only pearl/diamond)
I cant help but what is Sunshine Ranch?
Some say that you can find it in flocessy ranch or in a route with about 3 ledges in a row in pokemon black 2 without any cheats
You have to wait for an event if you don't want to cheat. Or you can get it on Pokemon ranch. Or if your friend has it, YOU SHOULD DEFINITELY TRY TRADING!
It meens that you will be sending that Pokemon to your my Pokemon ranch game and it will be on your wii my Pokemon ranch
you cannot get shinnies on ranch you can only transfer your shiny Pokemon to ranch
there isn't a Pokemon ranch on Pokemon diamond, its a complete other game! there isn't a Pokemon ranch on Pokemon diamond, its a complete other game!
You have to have it on your DS game. Then transfer it to Your Pokemon Ranch.
Deposit more Pokemon
can get a mew on the ranch, but mew is the 1000nth Pokemon. you get it when you have 999 Pokemon on the ranch.
Platinum is only compatible with Pokemon Ranch in Japan.