Grass-, Electric-, Rock-, and Fighting-type moves are super effective against Walrein. Walrein is an Ice- and Water-type Pokémon, and the official Pokédex lists all four types as weaknesses.
Why these moves are super effective
Walrein’s two types are Ice and Water. The Pokémon Company International’s official Walrein Pokédex entry lists Grass, Electric, Rock, and Fighting as its weaknesses.
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Type modifiers for a dual-type Pokémon are combined. The official Pokémon Brilliant Diamond and Pokémon Shining Pearl battle guide explains that a super-effective attack deals double damage in its example and that the modifiers for both of a Pokémon’s types are applied together.
Choosing a move in battle
All four listed types are super effective; type effectiveness alone does not rank one above another. Check the move’s type first, then consider its power and other battle factors. Super effective describes the type matchup, but it does not guarantee a knockout.
Quick Recap
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