Ninjask is probably the best option

Pros
Ninjask @ Focus Sash
Ability: Speed Boost
EVs: 252 HP / 252 Spe
Jolly Nature
IVs: 0 Atk
- Baton Pass
- Swords Dance / Hone claws
- Double Team
- Protect
Cons
- Using Double team is a bit Risky.
Scolipede is your second best option

Pros
- Likes you said, Access to iron Defense
Scolipede @ Leftovers (focus sash is you don't use substitute)
Ability: Speed Boost
EVs: 252 HP / 4 Def / 252 Spe
Jolly Nature
IVs: 0 Atk
- Iron Defense / Substitute
- Swords Dance
- Double Team
- Baton Pass
- No recovery which makes iron defense unreliable
Using Double team is a bit Risky.
Blaziken is probably your worst option.

Pros
Access to hone claws, Though Ninjask utilises it way better so this might not count as a pro.
Can actually attack if hou choose to use high jump kick
Access to bulk up.
Blaziken
Ability: Blaze @ Leftovers (Focus Sash if you use High Jump Kick)
EVs: 252 Atk or HP / 252 Spe
Jolly Nature
- Swords Dance / Hone claws / Bulk up
- Protect
- Double Team
- High Jump Kick / Substitute
Cons
Can't outspeed Shadow rider Calyrex, Zacian, Scarf kyogre and regieleki even with full speed investment and speed boost.
Has better sets that are way more reliable.
Using Double team is a bit Risky.