Thanks to its blistering base 115 Speed and great supporting movepool, Azelf works as the second-best dual screener in the game, falling short of only Deoxys-S. This set helps more frail Pokemon such as Sharpedo and Porygon-Z set up and begin their sweeps, as it supplies them with a temporary defensive boost from Light Screen and Reflect. Taunt shuts down opposing Taunt users, walls, and in extreme cases, setup sweepers. This can also help keep hazards off Azelf's side of the field until setup is complete. Stealth Rock is great for general team support, damaging the opponent upon switching in, and breaking any stray Focus Sashes that might delay the sweep of a teammate.Unlike Deo-D Super Effective and STAB moves can actually can OHKO it.
Even Scizor KOs with Bullet Punch.
So does Azumarril in the rain.
No Magic coat, so pranksters just walk all over it.
This thing is really much more inferior to Deo-D. The bulk doesn't even come close.
It's only niche is OU is trick and Explosion (which is sadly nerfed now)
Read this and tell me its not outright telling you this is a mini Deoxys-S, a pokemon that outclass Deoxys-D. Azelf is way more threatining than Deoxys-D, speed means everything simply put. Has Azelf ever been suspected for BL at least? No. What makes Deoxys-D any more ban worthy to ubers?