Hey /vp/, I made a stall team and it's been winning me more games than usual but I encounter a lot of bumps now and then. Can you help me polish the team?

Skarmory @ Leftovers
Ability: Sturdy
Shiny: Yes
EVs: 232 Def / 252 HP / 24 Spd
Impish Nature
- Roost
- Spikes
- Brave Bird
- Whirlwind
Usually my lead, I had a Donphan on my team that would otherwise be my lead if the enemies lead was a fire type like Infernape. Also, he helps (along with Amoonguss) take care of enemies who have had used Swords Dance or something. I also use him for his steel type to resist a lot of things that my team would usually be OHKO'd by. I would put Stealth Rock on Skarmory but I don't want to leave it with no way to deal damage.
Blissey @ Leftovers
Ability: Natural Cure
EVs: 252 Def / 252 HP / 4 SDef
Bold Nature
- Wish
- Protect
- Seismic Toss
- Toxic
One of the most valuable members of my team for being so tanky, I use her to heal her team and deal some modest damage.
Slowbro @ Leftovers
Ability: Regenerator
EVs: 252 Def / 252 HP / 4 SAtk
Bold Nature
- Scald
- Ice Beam
- Slack Off
- Thunder Wave
Slowbro and Amoonguss are a pair that help each other out. Slowbro is more physically defensive than anything than else. I use him to suck up hits and take hits Amoonguss would usually fall too. I also use him to cripple the enemy and deal some modest damage.