Overview
Zekrom, along with its counterpart Reshiram, came out of the Gen 5 Movepool lottery in good shape. Being stuck with Dragon Breath hurts its Dragon-type performance compared to the plethora of Dragon Tail/Outrage Dragons; however, Zekrom received pretty much the best Electric-type moveset it could have hoped for in Charge Beam/Wild Charge. Backed by a massive Base 275 Attack stat, Zekrom is the undisputed #1 Electric-type, with significantly higher DPS than Electivire and bulk higher than Raikou.
Zekrom is duoable, but it requires extremely good RNG and heavy investment, or Windy weather. For the Zekrom duo guide, click here.
The Zekrom trio is, to be blunt, easy. The fact that the Zekrom duo is even possible, albeit extremely hard, means that 3-manning it will be quite easy; even against Outrage, Level 30 counters are strong enough to win comfortably with 3 people.
vs. Crunch
Dialga
Min. Level: 20
Dragon Breath
Draco Meteor
Rayquaza
Min. Level: 25
Dragon Tail
Outrage
Salamence
Min. Level: 25
Dragon Tail
Outrage
Garchomp
Min. Level: 25
Dragon Tail
Outrage
Palkia
Min. Level: 25
Dragon Tail
Draco Meteor
Dragonite
Min. Level: 25
Dragon Tail
Outrage
Mamoswine
Min. Level: 25
Powder Snow
Avalanche
Hydreigon
Min. Level: 25
Dragon Breath
Dragon Pulse
Weavile
Min. Level: 30
Ice Shard
Avalanche
Latios
Min. Level: 30
Dragon Breath
Dragon Claw
Excadrill
Min. Level: 30
Mud Slap
Drill Run
Glaceon
Min. Level: 30
Frost Breath
Avalanche
Groudon
Min. Level: 30
Dragon Tail
Earthquake
Togekiss
Min. Level: 30
Charm
Dazzling Gleam
Gardevoir
Min. Level: 30
Charm
Dazzling Gleam
Granbull
Min. Level: 30
Charm
Play Rough
Latias
Min. Level: 30
Dragon Breath
Outrage
Giratina-Origin
Min. Level: 30
Dragon Tail
Dragon Pulse
Use Dragons; if you don't have Dragons, use Ice-types; if you don't have Ice-types, use Fairies. To be frank, trioing Zekrom is really easy, and the only thing you really need to pay attention to is that you have the right moves on your Pokemon.
vs. Flash Cannon
Palkia
Min. Level: 20
Dragon Tail
Draco Meteor
Rayquaza
Min. Level: 25
Dragon Tail
Outrage
Salamence
Min. Level: 25
Dragon Tail
Outrage
Dialga
Min. Level: 25
Dragon Breath
Draco Meteor
Garchomp
Min. Level: 25
Dragon Tail
Outrage
Dragonite
Min. Level: 25
Dragon Tail
Outrage
Latios
Min. Level: 25
Dragon Breath
Dragon Claw
Excadrill
Min. Level: 30
Mud Slap
Drill Run
Groudon
Min. Level: 30
Dragon Tail
Earthquake
Hydreigon
Min. Level: 30
Dragon Breath
Dragon Pulse
Mamoswine
Min. Level: 30
Powder Snow
Avalanche
Giratina-Origin
Min. Level: 30
Dragon Tail
Dragon Pulse
Latias
Min. Level: 30
Dragon Breath
Outrage
Glaceon
Min. Level: 30
Frost Breath
Avalanche
Mewtwo
Min. Level: 30
Psycho Cut
Ice Beam
Togekiss
Min. Level: 30
Charm
Dazzling Gleam
Gardevoir
Min. Level: 35
Charm
Dazzling Gleam
Alolan Exeggutor
Min. Level: 35
Dragon Tail
Dragon Pulse
Flash Cannon, if not dodged, hits Ice-types and Fairy-types very hard. While Mamoswine, Glaceon, Gardevoir, and Togekiss can still comfortably trio, dodging Flash Cannons will improve their performance by a fairly significant amount.
Weavile needs to be at Level 40 to trio against Flash Cannon; alternatively, Level 30 Weavile can be trio-viable against Flash Cannon if you can dodge all Flash Cannons.
vs. Wild Charge
Garchomp
Min. Level: 20
Dragon Tail
Outrage
Dialga
Min. Level: 20
Dragon Breath
Draco Meteor
Mamoswine
Min. Level: 25
Powder Snow
Outrage
Rayquaza
Min. Level: 25
Dragon Tail
Outrage
Salamence
Min. Level: 25
Dragon Tail
Outrage
Latios
Min. Level: 25
Dragon Breath
Dragon Claw
Groudon
Min. Level: 25
Dragon Tail
Earthquake
Dragonite
Min. Level: 25
Dragon Tail
Outrage
Excadrill
Min. Level: 30
Mud Slap
Drill Run
Hydreigon
Min. Level: 30
Dragon Breath
Dragon Pulse
Palkia
Min. Level: 30
Dragon Tail
Draco Meteor
Latias
Min. Level: 30
Dragon Breath
Outrage
Giratina-Origin
Min. Level: 30
Dragon Breath
Dragon Pulse
Alolan Exeggutor
Min. Level: 30
Dragon Tail
Dragon Pulse
Mewtwo
Min. Level: 30
Psycho Cut
Ice Beam
Flygon
Min. Level: 30
Dragon Tail
Dragon Claw
Weavile
Min. Level: 30
Ice Shard
Avalanche
Rhyperior
Min. Level: 30
Mud Slap
Earthquake
Wild Charge is a little harder than Crunch or Flash Cannon, but the trio is still so easy that as long as you have the right movesets and your Pokemon are at the specified levels or higher, you'll win with plenty of time to spare.
vs. Outrage
Dialga
Min. Level: 20
Dragon Breath
Draco Meteor
Mamoswine
Min. Level: 25
Powder Snow
Avalanche
Garchomp
Min. Level: 30
Dragon Tail
Outrage
Gardevoir
Min. Level: 30
Charm
Dazzling Gleam
Togekiss
Min. Level: 30
Charm
Dazzling Gleam
Excadrill
Min. Level: 30
Mud Slap
Drill Run
Weavile
Min. Level: 30
Ice Shard
Avalanche
Glaceon
Min. Level: 30
Frost Breath
Avalanche
Mewtwo
Min. Level: 30
Psycho Cut
Ice Beam
Granbull
Min. Level: 30
Charm
Play Rough
Dragonite
Min. Level: 35
Dragon Tail
Outrage
Palkia
Min. Level: 30
Dragon Tail
Draco Meteor
Latios
Min. Level: 35
Dragon Breath
Dragon Claw
Groudon
Min. Level: 30
Dragon Tail
Earthquake
Latias
Min. Level: 30
Dragon Breath
Outrage
Jynx
Min. Level: 35
Frost Breath
Avalanche
Rayquaza
Min. Level: 40
Dragon Tail
Outrage
Salamence
Min. Level: 40
Dragon Tail
Outrage
Without dodging, sub-Level 40 Salamence and Rayquaza are non-viable due to how often they will die to Outrage at lower levels.
If you can consistently dodge all Outrages, Salamence and Rayquaza become trio-viable at Level 25.