well it depends. If you just put one in or two different Pokemon(other than ditto) it will just be trained, however if you put a Pokemon in with a ditto other than legendaries with the acception of manaphy it will make an egg hope this answers your question.
Nothing.
It depends on what Pokemon you have in the daycare. The Pokemon that hatches from the eggs given to you by the daycare man will be the pre-evolved form of the female Pokemon you have in the daycare.
They will simply gain Exp. You can't breed legendary pokemon.
Well in daycare it won't evovle or learn new moves if it already has 4 moves. and to evovle just take it out of daycare and lvl it up and it will evovle
Depends which daycare.
You have to pull the pokemon out of the daycare to check the level
No, it is not possible to get baby Pokemon in the daycare.
There is not a daycare in kanto
Nothing special will happen, it will continue to level up because Pokémon in the daycare cannot evolve.
Well, if you go on summary and go onto their moves whatever is at the top will be forgoton if the Pokemon learns a new move. P.S. That only happens in the daycare.
You can only give 2 Pokemon to the daycare centre
a daycare checker is an app on Pokemon diamond and pearl. It lets you see what 2 Pokemon are in daycare and lets you see what level they are.