Marth said:
Gonna do a solo Lopunny run, just so I can say I beat the Elite Four with the Pokemon equivalent of a fluffy bunny.
You'll probably need to get it close to level 100 to win. Lopunny isn't a particularly good Normal-type, and Normal is the worst STAB, since it can't do better than 1x damage on anything, all Rocks take 0.5x, all Steels take 0.5x (S/R or R/S take 0.25x) and all Ghosts are immune. Making matters worse is Lopunny doesn't have any decent abilities from what I recall, nor decent stats.
Expect problems.