Dewpider
Why is nobody talking about this monster? Dewpider basically has Huge Power on its Water STAB. Here's a few cute calculations:
196+ Atk Life Orb Water Bubble
Liquidation vs. 0 HP / 196 Def Eviolite
: 17-21 (80.9 - 100%) -- 6.3% chance to OHKO
196+ Atk Life Orb Water Bubble
Liquidation vs. 236 HP / 196 Def Eviolite
: 13-17 (50 - 65.3%) -- guaranteed 2HKO
196+ Atk Life Orb Water Bubble
Liquidation vs. 0 HP / 156 Def Eviolite
: 17-21 (70.8 - 87.5%) -- guaranteed 2HKO
196+ Atk Life Orb Water Bubble
Liquidation vs. 116 HP / 236+ Def Eviolite
: 13-17 (52 - 68%) -- guaranteed 2HKO
196+ Atk Life Orb Water Bubble
Liquidation vs. 76 HP / 212+ Def
: 12-14 (48 - 56%) -- 68.4% chance to 2HKO
196+ Atk Life Orb Water Bubble
Liquidation vs. 36 HP / 196 Def
: 16-19 (69.5 - 82.6%) -- guaranteed 2HKO
196+ Atk Life Orb Water Bubble
Leech Life vs. 76 HP / 212+ Def
: 12-16 (48 - 64%) -- 96.5% chance to 2HKO
Nothing enjoys switching in. Leech Life hits Water-types + recovers Dewpider's lost health from Stealth Rock and such. To beat Cottonee, it has Poison Jab; Croagunk, Hidden Power [Psychic]; Ferroseed, Hidden Power [Fire]. Dewpider's also got some nice bulk special-wise, and
just enough Speed to run a Choice Scarf set. Plus, it can't be burned, and technically has a Fire-type resistance thanks to Water Bubble. Will it be the best thing ever? No, probably not. But it hasn't been discussed much and it's super cool!