Zapdos @ Rocky Helmet
Ability: Static / Pressure (either is fine, i use static on cart since it happens to be the one i have)
EVs: 252 HP / 252 Def / 4 Spe
IVs: 0 Atk
- Thunderbolt / Discharge
- Heat Wave
- Hidden Power [Ice]
Despite Salamence's lessened usage and Mimikyu's new access to a more powerful Z-move, I still find myself using this particular mon as my favorite glue mon, you really cannot find a better mon to repeatedly come in on Gyarados/Ferrothorn and act as a soft check to blaziken and be an earthquake immune for teams that sorely need it... and even as a mon that can square up with a drumming azu with ease!
Zapdos's naturally good speed allows it to even outspeed 252 speed Jolly azu (121>112), and i'm not sure if webs azu is a thing in 3v3 considering I have seen it exactly zero times, but it's immune to webs so it will virtually always go before the rabbit.
Both slashed options for Electric STAB can fell an Azumarill with 50% health from Z-Belly Drum, but Sitrus can be disposed of with a combination of Discharge and one Rocky Helmet damage, or one straight Thunderbolt. The potential have a 51% chance to paralyze in a turn as they use a contact move is VERY nice indeed, don't simply take the move that takes azu the best, there really are more mons in this meta. If you use Pressure, the decision may become more clear towards Thunderbolt, though:
0 SpA Zapdos Thunderbolt vs. 196 HP / 0 SpD Azumarill: 150-176 (75 - 88%) -- guaranteed 2HKO
0 SpA Zapdos Discharge vs. 196 HP / 0 SpD Azumarill: 134-158 (67 - 79%) -- guaranteed 2HKO
90/85 may seem like insufficient bulk to get the job done vs 896 attack STAB aqua jet, but it gets the job done if Azumarill uses the 1 move it can use to go before Zapdos.
+6 252+ Atk Huge Power Azumarill Aqua Jet vs. 252 HP / 252+ Def Zapdos: 135-160 (68.5 - 81.2%) -- guaranteed 2HKO
Any other move after BD is suicide, as Zapdos will kill you first.
I wouldn't say that Choice Band is taken *comfortably*, but it can take a Play Rough on the chin and farm Rocky Helmet damage with Roost (two RH hits to make your Electric STAB kill):
252+ Atk Choice Band Huge Power Azumarill Play Rough vs. 252 HP / 252+ Def Zapdos: 114-135 (57.8 - 68.5%) -- guaranteed 2HKO
Splashable as hell, and happens to beat this mon. The best mon I ever traded for was my wonderful Static Bold HP Ice Zapdos, it's so damn useful in so many situations on so many teams. Try it out!