While most abilities at least have use, some of the natural abilities are more preferable. One example is anything with Unnerve. Lots of them who get this will prefer their other abilities, such as Haxorus preferring to plow through potential Levitators with Earthquake, Arbok's status healing chance or potential free turn, and Wobbuffet preferring to trap opponents. In some ways, those with Doubles abilities are not of use in singles. Several things have Telepathy, but at least their immunity to partner attacks are great.
This reminded me of a blog I did roughly two-and-a-half years ago highlighting how beneficial the ability is to the Pokemon. It could be outdated, but I felt that most on that list is still accurate now.
Thanks for reading.