You can't in the one in Cerulean and on four island just put one in and the lady will ask if you want to put another one in.
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Breed in the daycare with ditto
The only ways to get more than one of a Pokemon are as follows: 1. Catch another 2. Put it in the daycare with another of the same Pokemon of the opposite gender and wait for an egg 3. Put it in the daycare with a Ditto and wait for an egg
yes, it is a mansion Pokemon well you can also breed it at the daycare with a ditto, then hatch the egg
If leave Pokemon in the daycare, they level up according to how much you travel. More travel = more experience. Also, if you leave two Pokemon (one boy and one girl or one undetermined) and they like each other, you'll find an egg.
When your pokemon is in daycare, every one step, is one exp point Pokemon do not evolve in daycare however. hope it helps!