To start the challenge against Sierra in Pokemon GO, trainers must first collect 6 Mysterious Components by defeating Rocket Grunts at select PokeStops. She can then appear in floating Rocket Balloons, or at PokeStops.
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Defeating Sierra leads to an encounter with a shadow Pokemon that can be purified in Pokemon GO, 1000 Stardust, and a random selection of 2 of the following rewards:
x1 12km Egg x1 Revive x1 Max Revive x1 Max Potion x1 Unova Stone x1 Sinnoh Stone
Sierra’s First Pokemon - Sneasel
Sneasel is always the first Pokemon Sierra will pick in Pokemon GO. It is both a Dark and Ice-type, and is weak to Fighting, Rock, Bug, Steel, Fire, and Fairy-type moves. It resists damage from Ghost, Ice, Dark, and Psychic-type moves.
Best Sneasel Counters
Sierra’s Second Pokemon - Gliscor, Granbull, Ampharos
Sierra’s second and third Pokemon are randomly selected, and there is no way to tell which one she will pick before the battle begins. This is why it’s important to try and pick characters that are effective against multiple options.
Best Gliscor Counters
Gliscor is a dual Ground and Flying-type with a weakness to Ice and Water-type moves. It has resistances to Electric, Fighting, Poison, Bug, and Ground-type moves. Mamoswine is a very good pick as it can be used as an effective Pokemon in other Sierra battles. Other potential counters include:
Best Granbull Counters
Granbull is a Fairy-type Pokemon, meaning it is weak to Poison and Steel-type moves. It resists Fighting, Bug, Dark, and Dragon-type moves. Good Steel-types are preferred to counter Granbull, as they can also be used for the first Sneasel battle. Other effective Pokemon to use include:
Best Ampharos Counters
Ampharos is an Electric-type Pokemon, so it only has a weakness to Ground-type moves. It has resistances to Flying, Steel, and Electric-type moves. Mamoswine with one Ice-type move is a solid pick to use against Sierra for potential encounters with both Ampharos and Gliscor. Other effective Pokemon to pick include:
Sierra’s Third Pokemon - Houndoom, Kingdra, Drapion
Best Houndoom Counters
Houndoom is both a Dark and Fire-type Pokemon with a weakness to Fighting, Ground, Rock, and Water-type moves. It resists Ghost, Steel, Fire, Grass, Ice, Dark, and Psychic-type moves. A Mamoswine with Ground attacks can be effective and used to fight elsewhere, but some of the best counters for Houndoom are:
Best Kingdra Counters
Kingdra is a dual Water and Dragon-type Pokemon that is weak to Dragon and Fairy-type moves. It resists Steel, Fire, and Water-type moves. Dragon-types are some of the most powerful Pokemon in the game, so should be favored over Fairy-type characters. Great choices include:
Best Drapion Counters
Drapion is both a Poison and Dark-type with a weakness to Ground-type moves only. It resists Psychic, Poison, Ghost, Grass, and Dark. Just like Ampharos, Mamoswine is the best Ground-type pick against Drapion because it can be used on other potential Sierra fights. It also has the same great counters as Ampharos:
Pokemon GO is available now on Android and iOS devices.
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