Arctovish

Arctovish is a Pokemon with middling stats and awful typing. Its one saving grace is the move Fishious Rend, which, combined with Choice Band, has tremendous wallbreaking power when Arctovish moves first. However, its Ice typing makes Arctovish weak to Stealth Rock and STAB moves from prime Fishious Rend targets, such as Gigalith, Regirock, and Aggron, requiring predictions to get in safely on them. Unfortunately, the problems don't end there. Arctovish's low Speed means faster attackers such as Silvally-Fairy and Mesprit will often win one-on-one. Other slow wallbreakers such as Centiskorch and Trevenant have considerably easier times getting in on defensive Pokemon like Eldegoss. There's also the ever-prevalent Jellicent, which thoroughly shuts down Fishious Rend.