Trainers in Pokemon GO can get ready for a battle with Pheromosa by looking over this list of ways to beat it and places where it is weak.

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Ultra Beasts are hard to beat in Pokemon GO, but the rewards for doing so are well worth the trouble. Even if a player has already collected all of the Ultra Beast Pokedex entries, PvP and PvE battle fans should still collect these powerful Pokémon. A few of them have powerful move sets and are poised to become popular options in the future PoGO metagame.
To defeat an Ultra Beast in Pokemon GO, trainers must first identify the weaknesses of each raid boss and devise a strategic roster of countermeasures. This will require Pheromosa to study the weaknesses of bug- and fighting-type dual pairings and assemble a formidable flying-type team to defeat the Ultra Beast.
Ultra Beast battles can be quite difficult, and the average player using the correct counters will still want to enter with about four other allies. Parties of that size that focus on Pheromosa’s weaknesses should be able to earn their encounter rewards before the timer runs out.
Pheromosa Deficiencies
This Ultra Beast is of the Bug and Fighting type, making it twice as vulnerable to Flying-type moves and vulnerable to Fairy, Fire, and Psychic-type attacks.
Top Phermosa Countermeasures
Wing Attack/Sky Attack Moltres
Rayquaza – Air Slash/Hurricane
Braviary – Air Slash/Dangerous Bird
Yveltal – Gust/Tropical Storm
Tornadus – Air Slash/Tropical Cyclone
Staraptor – Wing Assault/Courageous Bird
Tornadus (Incarnate) – Wind Slash/Tornado
Honchkrow – Peck/Sky Attack
Tornadus (Therian) – Wind/Tropical Cyclone
Unfezant – Sky Attack/Air Slash
Charge Beam/Drill Peck: Zapdos
Extrasensory/Brave Bird Ho-Oh
Mewtwo – Confusion/Psychic Attack
Toucannon – Drill/Peck Drill
Lugia – Extrasensory/Aeroblast
The 2x Flying-type weakness is a great strategy to focus on, and players who have raided for a while are likely to have some top-tier Flying-types already powered up. This should be all the information trainers need to put together a good team of counters for Pheromosa Ultra Beast Battle Raids in the mobile AR game. Think about whether it would be worth spending some Elite TMs to give the counter team the best move sets for this battle. The majority of these counter options are fairly evergreen, and future counter rosters would likely benefit from the investment.
Check back soon for a lot more news, guides, and updates about Pokemon GO. Trainers, until then, best of luck out there!