They appear randomly like legendary pokemon's, if u have completed all gyms and elite fours.
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It's simpler if you buy a Masterball and have high stat Pokemon.
From Battle Frontier and Victory Road.
You slather honey on a golden brown to attract pokemon. Do this until you find a cherubi. Then level it to level 25 with high friendship during the day.Hope this helps!
Victory Road has fairly high level Pokemon in it
High level Pokemon.