One of the three legendary birds, Articuno is from the first generation of Pokémon and you can capture them in Pokémon Go by participating in five-star raids. These raids are the ones you want to group together with several reliable trainers and work together to take them down. It's not an easy fight, and knowing how to best counter Articuno allows you to complete the raid in a timely manner.
Weaknesses of the Articuno
Articuno is a Flying and Ice-type Pokémon. It is weak on Fire, Electric, and Steel-type attacks, and takes the most damage from Rock-type moves. You want to focus on having a Rock-type Pokémon, and you have a lot of choices to choose from.
Pokémon counters in Articuno
The best Pokémon you can use to counter Articuno are Rhyperior, Tyranitar, and Terrakion.
Rhyperior is a Rock and Ground-type Pokémon. Due to the way it's built, it has great defenses, but it also has a variety of ideal Rock-type attacks that you can use against Articuno. You mainly want to focus on these attacks, limiting your options when using it during the raid. It has a max CP of 3733, attack of 241, defense of 190, and stamina of 251. The best moves you can use are slamming for its fast move and stone edge or demolitionist. Of the two load moves, the rock troubleshooter is a legacy move, so most coaches will need to use the stone edge against Articuno.
Your next choice is Tyranitar, the Dark and Rock-type Pokémon. It's a good alternative to use in your line-up, and you can expect decent results with it. It's a favorite among many to use in many Pokémon Go raids, and Articuno is no different. He has a max CP of 3, offense of 834, defense of 251, and stamina of 207. While he has a variety of weaknesses, Articuno shouldn't be able to exploit them. The best attacks he can know for this raid include the smack down and stone edge. Unfortunately, the smack down is an inherited fast move, so more trainers may want to rely on Iron Tail as it provides more damage and energy per turn than Tyranitar's other attack choice.
The final choice is Terrakion, the legendary Rock and Fighting-type Pokémon. Terrakion is one of the harder Pokémon to find due to its brevity as a five-star raid. Despite this, it is a great choice to go down Articuno. He has a max CP of 3, offense of 698, defense of 260, and stamina of 192. Much like Tyranitar, he has a variety of weaknesses, but Articuno shouldn't take advantage of them. You want yours to know all about for its fast movement and glide for its charge attack.
If you do not have these options, there are several other options available to you. There are Rampardos, Gigalith, Omastar, Alola Golem, Heatran, Aggron, Darmanitan, Excadrill, Metagross, Golem, Regirock, Lunatone and Solrock.