ok so ive been competitive battling for a while now and my team is doing great but for some reason the same pokemon screw me over and im missing firepower but i dont find anything i like i play ou so i just want some suggestions so here it is my ou team:

HappyHippo(Hippodown)*Leftovers
Sandstream
Bold nature
Evs Hp 252/Atk 42/Def 216
Earthquake
Stockpile
Slack off
Stealth rock
Sandstream
Bold nature
Evs Hp 252/Atk 42/Def 216
Earthquake
Stockpile
Slack off
Stealth rock
My lead and def wall i ussually start stockpiling and the stealth rock when i know ill survive if not then just stealth rock and die.Still it takes some damage and i needed something to lead and wall with healin so this went well i was thinking taking stocpile an giving ice fang but i prefered defensive play with this one.

Auttumn(Breloom)*toxic orb
Poison heal
jolly
Evs Hp 23/Atk 235/Speed 252
Spore
Focus punch
Seed bomb
Stone edge
Basic physical sweeper poison heal for toxic spikes and gave it toxic orb anyways for trickers.The basic idea is sporing and then attack with what suits for the ocasion.I was somewhat undecided on fourt i tought facade but i gave stone edge for gliscor and giarados if my gengar died or if i got a spore on it.

ScaryWinter(Weavile)*Choice band
Pressure
Jolly
Evs Hp 40/Atk 252/Speed 216
Night slash
Aerial ace
Ice punch
Brick break
Pressure
Jolly
Evs Hp 40/Atk 252/Speed 216
Night slash
Aerial ace
Ice punch
Brick break
Revenge killer says it all i didnt place ice shard because ice punch is stronger and i think it already is fast enough i used to have a infernape here but this is better as revenge killer and infernape wasnt working so i came with this.I was very undecided on its move pool but i think the coverage is what i needed for my team.

Black Phantom(Gengar)*Black sludge
Levitate
Modest
Evs Atk 58/Sp.Atk 200/Speed 252
Hypnosis
Shadow ball
Thunder bolt
Explosion
Levitate
Modest
Evs Atk 58/Sp.Atk 200/Speed 252
Hypnosis
Shadow ball
Thunder bolt
Explosion
My 1/2 special attacker its no very good cover but it does the job takes my biggest treats out gyarados and most flying, and its my favorite i need suggestions to change its moveset for higher coverage and im starting to think about taking out hypnosis becaues of breloom.

NonsingingSiren(Vaporeon)*Life orb
Water absorb
Evs Def 188/ Sp.atk 252/Speed 70
Surf
Ice beam
Hp Electric
Signal beam
My special attacker not much to say except is a very good counter to water and waterfall gyarados it never get ohko by 1 DDgyarados.

OMFGBLISSEY(Blissey)*Leftovers
Natural cure
Calm
Evs Hp 252/Sp.atk 69/Sp.def 189
Aromatherapy
Protect
Wish
Shadow ball
Natural cure
Calm
Evs Hp 252/Sp.atk 69/Sp.def 189
Aromatherapy
Protect
Wish
Shadow ball
Normal blissey except i gave it shadow ball for celebi and azelf who trie to set up.
Thats it ill take any suggestions thank you!.
and im kinda a noob to competitive battlin so be gentle.
and im kinda a noob to competitive battlin so be gentle.