Originally Posted by Fat MetaNite
Leading Tyranitar also makes a could way to stop Azelf. While it may set up Stealth Rocks, you'll break its Sash and if it U-Turns (though you'll be dealt SE damage) you can Pursuit it for the OHKO.
Few things can actually counter the anti-lead without taking a chunk from U-turn, however the best way to beat it is to out-predict.
In fact, pursuiting an u-turning azelf avoids any damage from u-turn, since pursuit comes first with 80bp (at least on shoddy)
so the best counter for the anti-lead/scarfer (and even for the suicide, since it's only setting up the rocks) is a T-Tar w/pursuit.