How do I make this PU team ladder further?

Question

Right now, I'm stuck at about 1200 on the ladder. Feel free to critique the way I use this team as well as the team itself.

sidewalk (Vibrava) (M) @ Eviolite
Ability: Levitate
Shiny: Yes
EVs: 252 HP / 128 Def / 128 SpD
Careful Nature
- Defog
- Roost
- Earthquake
- Toxic
This performs a very similar role as a Flygon would usually perform in UU. It safely switches into entry hazards and uses defog. It can also function as a stall under the right conditions.

Pikachu's stupid (Raichu) (M) @ Life Orb
Ability: Lightning Rod
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Thunderbolt
- Surf
- Signal Beam
This is a classic setup sweeper. Its three attacks grant at least normal effectiveness against all Pokemon allowed in PU (when not considering abilities). This is used as a lead only if the opponent has a lot of water Pokemon.

Fairy Slayer (Probopass) (M) @ Red Card
Ability: Magnet Pull
Shiny: Yes
EVs: 252 HP / 4 Def / 252 SpA
Modest Nature
IVs: 0 Atk
- Power Gem
- Flash Cannon
- Earth Power
- Toxic
This is my phazer. I send it out when a sweeper is setting up and uses its sturdy and red card to force switches. After the red card is consumed, it becomes a tank.

window (Articuno) @ Leftovers
Ability: Pressure
EVs: 252 HP / 172 Def / 84 SpD
Bold Nature
IVs: 0 Atk
- Toxic
- Roost
- Protect
- Ice Beam
This stall is capable of defeating many different kinds of Pokemon using toxic and roost, granted it doesn't switch into stealth rock. It can tank most hits from Pokemon that don't use moves to boost their attack stats.

Floatzel (M) @ Life Orb
Ability: Water Veil
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Bulk Up
- Waterfall
- Ice Punch
- Taunt
This is my usual lead unless the opponent has a lot of water Pokemon. It uses bulk up and then whichever attack is more effective. Taunt is used mainly to prevent other sweepers from setting up, most notably Gorebyss and Crustle, which become dangerous after using shell smash.

Sorry it (Dusclops) (M) @ Eviolite
Ability: Pressure
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Will-O-Wisp
- Calm Mind
- Rest
- Shadow Ball
This stall is capable of defeating both physical and special attackers alike using a combination of will-o-wisp and calm mind. Pressure becomes immensely useful when the need to PP stall arises.

Comments

i see that you got that nice Balance core of Vibrana and Probopass going on, very good!
I suggest U-turn over Toxic, since you need that momentum more than Toxic.
Have Volt Switch over Earth Power on Probopass, as this forms a nice bulky Volt-Turn core.

This core can be very weak to threats like Fraxure (Outrage destroys Vibrana and Superpower beast Probopass), so I suggest a scarfer such as Mr. Mime. You can replace Raichu with Mr. Mime.

Now moving on to Dusclops: It's just not viable anymore. I would suggest Misdreavus as it provides better support for the team with W-o-W and also is a set-up sweeper with NP.

Floatzel's set is a bit off, try Banded Floatzel, you don't really need 2 set-up sweepers. Floatzel often finds limited opportunities to set-up and is not as threatening as something like Band.

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Do I REALLY have to use a fairy?

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Also, if my Floatzel gets a choice band, how would I deal with shell smashers?

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Shell Smashers? I don't really see any of them in PU, but I think you can still do damage with Specs Floatzel (HP Grass or Electric). though you would have too many special attackers.

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But the Crustles have sturdy...

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Crustle's got a suspect. Wait a while it might go.