You can't normally.You can go into the backyard if you hack the game that way you can go through anything but its pretty much useless you wont fin the Pokemon you left in the day care there sadly.
you can't get it in Pokemon ruby, you have to trade with a friend that has Pokemon sapphire or emerald.
to tell the truth I dont think there is a pokemon daycare on that one so you just have to level up and evolve your pokemon manually
no
it is fake and i believe its a hack of Pokemon ruby
Level 25.