Im sure you meant: How do you level up the pokemon in the day care center on ruby?
You walk around for a long time, each few dozen steps makes them gain exp.
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The Day Care in Pokemon Ruby is on the route West of Mauville City.
it depends each step you take is 1 experience point for each Pokemon you have in the day care centre
the daycare in Pokemon ruby is between verdanturf city and mauville city
Put 2 pikachu in the day care
If you left two Pokemon that are of different genders and are of the same egg group, you can get an egg from the Day Care Man outside of the Day Care after you've left the Pokemon there for a while.