>>44778497It became retroactively popular, just like the Arena Trap ban retroactively got it banned in all prior generations as well. Well, Clefable isn't even that popular, it's a meme 'mon in OU, just like Electivire, which has more usage.
It's actually UU, still, and not even the most used Pokemon in Gen 4 UU, it's only the 9th most used in the tier.