Lapras

At first glance, Lapras seems inferior to the UU Water-types due to its Ice typing, but it has a couple of useful traits that it can utilize well. Its high HP and Special Defense make it an excellent counter to common UU Water-types such as Milotic and Omastar. Lapras's Stealth Rock weakness may seem disappointing, but this is balanced by the ability to heal itself with Water Absorb, which allows Lapras to switch into any Water-type move and heal a quarter of its health. Due to Lapras's wide movepool, it can be used as a sweeper or as a supporter. This versatility gives the opponent a tough time at predicting what role Lapras plays on its team. These traits also make Lapras a reliable check to common Rain Dance teams thanks to Water Absorb, its 4x resistance to Ice-type moves, access to Thunderbolt, and its mammoth HP stat. All in all, Lapras should not be underestimated.