Sturdy according to type distribution:

Rock:

1. Geodude
2. Alolan Geodude
3. Graveler
4. Alolan Graveler
5. Golem
6. Alolan Golem
7. Onix
8. Sudowoodo
9. Shuckle
10. Nosepass
11. Aron 
12. Lairon
13. Aggron
14. Shieldon
15. Bastiodon
16. Bonsly
17. Roggenrola
18. Boldore
19. Gigalith
20. Dwebble
21. Crustle
22. Tirtouga
23. Carracosta
24. Relicanth
25. Regirock
26. Tyrunt
27. Carbink

Electric:

1. Alolan Geodude
2. Alolan Graveler
3. Alolan Golem
4. Magnemite
5. Magneton
6. Magnezone
7. Togedemaru

Steel:

1. Magnemite
2. Magneton
3. Forretress
4. Steelix
5. Skarmory
6. Aron
7. Lairon
8. Aggron
9. Shieldon
10. Bastiodon
11. Magnezone
12. Probopass
13. Togedamaru

Ground:

1. Geodude
2. Graveler
3. Golem
4. Onix
5. Steelix
6. Donphan

Flying:

1. Skarmory

Water:

1. Tirtouga
2. Carracosta
3. Relicanth

Psychic:

1. Cosmoem

Bug:

1. Pineco
2. Forretress
3. Dwebble
4. Crustle

Fighting:

1. Sawk

Dragon:

1. Tyrunt

Fairy:

1. Carbink

Ice:

1. Bergmite
2. Avalugg