Next floor
5355 steps.
It depends on the Pokemon you are hatching.
About 10,000 steps. If you don't believe, then check your Pokemon handbook (instructions booklet).
i think it matters what Pokemon you have like if you have Pokemon like magby you walk less steps but if you don't have Pokemon like magby you walk more steps[1ooo i guess]
about 7,000 steps
Start in front of Pokemon center in jubilife city,then 6 steps left,19 steps up, 10 steps left,6 steps up,and go in.
it takes some more than 10000 steps to hatch an happiny egg
You have to have the egg with you and walk several thousand steps.
You can use a bike and start going up and down a pass a lot and go through a lot of cities too.
5120, courtesy of serebii.net pokedex (check base egg steps)
Around 5,000 steps but each individual Pokemon has different hatching rates
you can't hatch a pikachu egg on diamond, it hatches in to a pichu.