Background Information
Zapdos has been a consistently stronger and absolute monster as a mixed attacker and a defensive attacker. You could say in terms of Competitive Pokemon, Zapdos is arguably the most famous mixed and defensive attacker starting it's debut in Gen 1 however many still choose to focus it's incredibly good special attack over it's physical bulk. In the Power of One movie, Zapdos grabbed many fans attentions serving as a temporary antagonist but for other Pokemon fans, Zapdos captured many people's attention in the Pokemon Adventures manga, playing not one but two major story roles during the Pokemon Adventures RGB and GSC chapter temporarily owned by two separate trainers. Can you guess who they are? In the RGB chapter, it made it's most impactful appearance during the absolutely amazing Siege on Saffron City storyline where Red, Green and Blue, the original Gen 1 protagonists, work together to put an end to Team Rocket's most powerful stronghold Saffron City through infiltration, outsmarting the Rocket Gym Leaders and last but not least dealing with the terrifying Thu-Fi-Zer, a three-headed bird fusion of Zapdos (
Thunder), Moltres (
Fire) and Articuno (Free
zer). It was during this chapter that Surge, one of the Rocket Gym Leaders, used Zapdos's flight and powerful electricity as a power source for his tech in the Pokemon Battle against Red while flying high in the air. That was surely no easy fight but it only gets harder for Red & friends later as Zapdos fuses with Articuno and Moltres to become Thu-Fi-Zer, Team Rocket's last resort as it scares Blue (female protagonist) due to her mysterious fear of bird-like Pokemon. Luckily the three make it out okay, defeating the powerful fusion. However it doesn't end there, it just continues making an impactful appearance in the GSC story arc where it is revealed that Blue has overcome her fear of birds by battling and capturing the legendary birds themselves and oh boy it gets even better. During the final battle, we get to see Red, Green and Blue command the three Gen 1 legendary birds as they take on the much more powerful and fearsome tower duo, Ho-Oh and Lugia, to the skies. During this battle it is rival Green who commands Zapdos. To this date, it is arguably Zapdos's and by extension the other legendary birds greatest appearance in any Pokemon medium, even possibly over the games.
Thu-Fi-Zer - Physical Defensive Set
Zapdos
Item: Leftovers
Ability: Pressure
Nature: Bold Nature or Timid Nature
EVs: 248 HP/172 Def/68 SpA/16 Spe or 252 HP/76 Def/176 Spe
Thunderbolt (Thu)
Heatwave (Fi)
Hidden Power Ice (Zer)
Roost
As the reference to the Pokemon Adventures fusion implies, Zapdos has access to Thu (Thunderbolt), Fi (Heatwave) and Zer (Hidden Power Ice) representing Zapdos, Moltres and Articuno who form the intimidating fusion known as Thu-Fi-Zer. Zapdos has an amazing typing paired with amazing stats and an amazing movepool that makes Zapdos the most competitively-viable legendary bird out of the three. Many powerful ground-types have absolute trouble dealing with this monster. Even popular sweepers or offensive tanks like Landorus and Garchomp will have great difficulty getting through Zapdos thanks to it's ground-type immunity and it's access to recovery and hidden power Ice. For some people however the Timid Nature and Speed is far more important as it gives Zapdos faster access to Roost as long as your aware that using roost will leave Zapdos vulnerable to the dreaded earthquake. Be it extra speed or extra defense, either way Zapdos is absolutely hard to take down due to not only it's good stats and typing but it's offensive power too boasting a staggering 125 Sp. Atk. As mentioned before Hidden Power Ice puts a stop to popular ground-types like Garchomp and Landorus who has a 4X weakness to Ice. Although not every steel-type is Scizor or Ferrothorn, Heatwave is still recommended as it is decent type-coverage against ice and steel-types who may pose an obstacle to Zapdos. And of course one cannot forget about Zapdos's STAB Thunderbolt as it adds more to Zapdos's status as a tank against water-type tanks, able to 2-shot tanks like Suicune. You may want Discharge during doubles but you won't get the same effective two-shot results against popular water-type tanks as thunderbolt. However Zapdos isn't perfect. Zapdos is a good physical tank, not a physical wall meaning there are some Pokemon that can still one-shot it. A great example is Weavile. Even if Zapdos is full invested in HP and Defense with a physically defensive nature, Weavile has a 6.3% chance of one-shotting it with Icicle Crash. Even if Zapdos revenge kills it, it should give you an idea how fast offensive Pokemon with good STAB can absolutely tear through Zapdos's physical defenses depending on the EV spread. However one must still not underestimate Zapdos in the end as Weavile makes up only one of the very small selection of very strong and effective counters against Zapdos. If you play competitive Pokemon then you know to never underestimate an effective tank cause if you don't have decent counters against Zapdos, you possibly have already lost the match before it started as this Pokemon shows no mercy for the reasons stated previously.