Dewpider @ Eviolite  
Ability: Water Bubble  
Level: 5  
EVs: 52 HP / 180 Def / 196 SpA / 20 SpD / 60 Spe  
Modest Nature  
IVs: 0 Atk  
- Tail Glow  
- Water Shuriken  
- Ice Beam  
- Giga Drain
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Optional Move(s):
- Steam Eruption  
- Sticky Web  
- Hidden Power [Fire]
Optional EV/IV(s):
- 52 HP / 180 Def / 200 SpA / 20 SpD  Modest Nature  
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Overview:
Dewpider is the most dangerous sweeper with the combination of Tail Glow and priority multi-hit move Water Shuriken further boosted by a great ability in Water Bubble. Thanks to its good bulk and resistances to Fire, Ground,Fighting and Water, it has more opportunity to set-up and has enough coverage option in its disposal. Dewpider is quite slow, while this can be migitated with Water Shuriken, faster pokemon with priority moves or bulky enough and resistance to Water can sometimes get in its way.