The Silph Road on Twitter: "Say goodbye to those Dark, Ghost, and Bug-type Raid bosses! With the arrival of Heatran comes a cold blast of 6 Water-types and 7 Ice-types, including Lapras,
Walrein ex (EX Legend Maker 89) - Bulbapedia, the community-driven Pokémon encyclopedia
Not having hard counters to Walrein and Salamence proved to be a big mistake, but even with three deaths in the Elite Four Tamago with Bulk Up swept through Steven and joins
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Walrein Raid Boss - Pokemon Go
Countering Walrein in Pokemon GO
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Walrein (Pokémon GO) - Best Movesets, Counters, Evolutions and CP
Pokemon Go Walrein - All You Need To Know
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Pokemon GO: Leader Sierra (Counters and Strategy) | Respawn Island