Gastrodon

Gastrodon has access to many unique tools that combine to make it a viable defensive threat in the UnderUsed metagame. Its Water / Ground typing combined with an excellent ability in Storm Drain gives it a number of useful resistances and immunities, particularly making it an optimal Scald switch-in as well as a threat to VoltTurn cores. Because of its access to Recover, Gastrodon further distinguishes itself from other Curse users like Swampert and Snorlax, as the instantaneous recovery allows Gastrodon to heal damage without putting itself to sleep. This lets it function as a more utility-oriented Curse user whose purpose in setting up with Curse is less to sweep than to improve its ability to check physical attackers. However, while Gastrodon has impressive special bulk, it is extremely weak to status, and its mediocre physical bulk prevents it from countering numerous offensive threats without a couple of boosts. Unlike Swampert, it does not possess Stealth Rock or Roar and has little utility outside of its helpful immunities. In addition, Gastrodon is hard countered by and gives free turns to Celebi, one of the tier's most dangerous sweepers. These cons, along with the sheer number of effective defensive Water-types in the tier, make Gastrodon a very niche Pokemon in UnderUsed.