Rate My Stall Team? - Gen 7 OU

Question

I love making stall team, and below is my team from Gen 6.
I am trying to decide which pokemon from Gen 7 will be suitable for my team, so any comments or constructive criticisms will be appreciated. Thank you.

Cancer (Gliscor) (M) @ Toxic Orb
Ability: Poison Heal
Shiny: Yes
EVs: 248 HP / 52 Def / 68 SpD / 140 Spe
Jolly Nature
- Earthquake
- Toxic (Cancer 1)
- Substitute (Cancer 2)
- Protect (Cancer 3)

Pretty standard Sub - Toxic Gliscor. I replace Toxic with Gulliotine in Battle Spot Singles.

Pig (Slowbro) (M) @ Leftovers
Ability: Regenerator
Shiny: Yes
EVs: 252 HP / 220 Def / 32 SpD / 4 Spe
Bold Nature
IVs: 0 Atk
- Scald (Hopefully RNG won't be biased)
- Thunder Wave (Really hate this 90% accuracy BTW, more like 10%)
- Iron Defense
- Slack Off

Check against Mega Metagross, Mega Charizard X, Cloyster, and many other physical attackers.

Satan (Chansey) @ Eviolite
Ability: Natural Cure
EVs: 156 HP / 252 Def / 100 SpD
Bold Nature
IVs: 0 Atk
- Seismic Toss (Still does something while taunted)
- Toxic
- Thunder Wave
- Soft-Boiled

It's the blob that everyone loves. Special wall that loses around 1/4 HP from Tapu Koko's Choice Specs Thunderbolt.

Tilted Bird (Mandibuzz) @ Leftovers
Ability: Overcoat
EVs: 248 HP / 136 Def / 108 SpD / 16 Spe
Bold Nature
IVs: 0 Atk
- Taunt (Say no to Forretress / Klefki)
- Roost
- Defog
- Foul Play

Entry Hazard remover, check for Mega Scizor and Smeargle.
I replace this guy with:

Gengar-Mega (M) @ Gengarite
Ability: Shadow Tag
Shiny: Yes
EVs: 186 HP / 70 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Shadow Ball
- Substitute
- Perish Song
- Destiny Bond

in Battle Spot Singles in order to get rid of someone who is disrupting the cycle of stall, most notably Clefable, opposing Chansey, Starmie, or any lower Mon that threatens the whole team.

Brain Tumor (Skarmory) (M) @ Rocky Helmet
Ability: Sturdy
Shiny: Yes
EVs: 252 HP / 100 Def / 156 SpD
Careful Nature
- Iron Head (Hits Mega Diancie and switch - in Espeon)
- Toxic
- Roost
- Iron Defense

Check for Physical Attackers that Slowbro cannot deal with (Mega Gyarados, Buzzwole, Kartana, etc).

Salt & Pepper (Tyranitar) (M) @ Lum Berry (really situational, sometimes run Sitrus Berry or Chople Berry)
Ability: Sand Stream
Shiny: Yes
EVs: 252 HP / 48 Def / 208 SpD
Careful Nature
- Stealth Rock (Mandatory in any OU team)
- Rock Slide (Stone Edge is ruined by wonderful RNG)
- Pursuit (Bye Mega Gengar)
- Thunder Wave

As I mentioned, I am looking for stallers from Gen 7. I am considering Toxapex, Celesteela, etc. I would appreciate any relevant / constructive comments. Thanks again for reading.

Comments

Gliscor: Roost is better than substitute because it lets you heal faster against more offensive Pokemon.
Slowbro: It's probably better to run max physical defense and replace iron defense with calm mind. That way, it can be used as a wallbreaker.
Chansey: You already have a lot of toxic users, so replace toxic with heal bell.

---

Thanks for your feedback, I wanted to explain why I have moveset like above:

Gliscor: I agree Roost is way more reliable and allows Gliscor to stay longer on the field, but Substitue & Protect allows me to stall for infinite number of turns against the Mon that is slower.

Slowbro: I also agree this guy can be used as a wallbreaker, but I put Iron Defense because this guy's role is a check to Physical Attackers, much like Skarmory is.

Chansey: The reason why I have so much Toxic is because my team's damage is very reliant on it. Heal Bell sounds nice because it cures poison from my teammates such as Slowbro and Mandibuzz, but I do not want to risk curing Gliscor from its Poison Heal - if its Toxic Orb was knocked off, the Heal Bell will permanently remove its Poison Heal, which makes Gliscor end up being useless.

---

Then teach it heal bell and not use it when Gliscor isn't holding the toxic orb.