I see a Trick Room team being your best bet for this team. Why? I have no idea. It just seems like it would do good for you, despite how much different your team will be. If you would rather not have this and instead have a team that more closely follows your first design comment and let me know. First off let us add in your new lead. Bronzor will do well here.
Bronzor @ Evolution Stone
Trait: Levitate
EVs: 224 HP / 4 Atk / 228 Def / 4 SAtk
Sassy Nature (+SDef, -Spd)
- Trick Room
- Stealth Rock
- Gyro Ball
- Psychic
Then we'll add in your second Trick Roomer.
Porygon @ Evolution Stone
Trait: Trace / Download
EVs: 240 HP / 36 Def / 156 SAtk / 76 SDef
Quiet Nature (+SAtk, -Spd)
- Trick Room
- Charge Beam
- Ice Beam
- Tri Attack / Recover
And now for your final Trick Roomer we'll give you a Litwick.
Hitomoshi (M) @ Life Orb
Trait: Flash Fire
EVs: 116 HP / 80 Def / 240 SAtk
Quiet Nature (+SAtk, -Spd)
- Trick Room
- Shadow Ball
- Fire Blast
- Hidden Power [Fighting]
Now, the perfect member for a Trick Room team is the incredibly powerful Munchlax.
Munchlax (M) @ Evolution Stone
Trait: Thick Fat
EVs: 236 HP / 236 Atk / 36 Def
Sassy Nature (+SDef, -Spd)
- Curse
- Frustration
- Earthquake / Pursuit
- Fire Punch
Now then, Rhyhorn is a powerful Pokemon but even more powerful is Cubone.
Cubone (M) @ Thick Club
Trait: Rock Head
EVs: 196 HP / 196 Atk / 76 Def / 36 SDef
Brave Nature (+Atk, -Spd)
- Bonemerang
- Fire Punch
- ThunderPunch
- Double-Edge
And now to replace Riolu we will have Machop.
Machop (M) @ Choice Band
Trait: No Guard
EVs: 196 HP / 196 Atk / 116 Def
Brave Nature (+Atk, -Spd)
- DynamicPunch
- ThunderPunch
- Fire Punch
- Payback
