a fast way to get the required steps is to go into the ironworks place with the spin/ slide tiles. There, find a place where the tile launches you into a wall. Place something heavy on your d-pad (and b button if you want it even faster) so it continually runs the loop. Then leave it on overnight with the charger plugged in. By morning, it should be at a high friendship level
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Walking 40000 steps is the ultimately best, and fastest way to "happiness Evolve" a pokemon, also the only Fast method that won't fudge up EV's.
This is not true, feed it a bunch of vitamins (easy especially if you are EVing it so you'd probably do this anyway), and it will probably have maxed happiness at around 20 or so, if that doesn't max it fight a few battles with the soothe bell. Either way walking is the slowest way to do it.