I love Umbreon,i have never heard about the leafgreen espeon thing,i wanted one in my leafgreen so traded Eevee to emerald cloned it and raised it from the 30 it was already at klike 5 levels,forgot happiness got deleted when traded i transferred it to Diamond,for this used REAL TIME!!!!!,i accidently evolved it at night and got an Umbreon in the Elite Four,now Umbreons one of my favorite 3 pokemon Umbreon,MewTwo,and Crobat.Got Espeon later didn't feel as good as Umbreon,but still nice(not only that it helped my finish my Eevee collection,i mean before i managed to get the 3 Kantoers).Oh and for that trick i'll try it and tell you my results.