I really can't imagine a list where either of these get out of the bottom 20. Neither really has any redeeming qualities and the game is already cluttered with pure water types, so they were entirely unnecessary entries into the series. It's popular to hate the baby pokemon, but at least some of them are cute and can sell toys, I've yet to see a big plushy of Luvdisc that all the 12 under crowd at anime cons are begging their parents for, and I doubt I ever will. Even if they made them, who would order them? I've pretty much got a personal vendetta against the pokemon who rank lower than this, but these two are likely the objective worst fully-evolved pokemon. I don't even honestly know which one to rank lower. I guess Alomola, simply because it was obviously supposed to evolve from Luvdisc, but then B/W decided to not have any links to previous gens. Hell, I don't get the reason for Alomola at all. B/W has more pokemon than any generation before it, and it didn't have an excess of water types, but it wouldn't have been lacking without it. Oh well, you have to have the occasional univerally crap pokemon to appreciate the good ones I suppose.
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