Walrein

Walrein can function as a decent tank thanks to its awesome bulk. While it is usually seen using its ability Ice Body alongside hail in the higher tiers, such a set unfortunately cannot be used in NU as hail is banned, limiting its viability in the tier. Even though Regice hits harder, which along with its better defenses makes it a better choice as an Ice-type tank most of the time, Walrein's niche over Regice is that it can handle Charizard better thanks to its Fire resistance granted by Thick Fat. Roar is another move Walrein has over its competitors, and its good Special Attack means it can still hit decently hard. A Water typing helps Walrein to take on Water- and Steel-types better than Regice, allowing Walrein to function as a decent tank that is difficult to OHKO. Walrein's lack of recovery, however, limits its effectiveness as a tank.