Rock Head according to type distribution

Fire:

1. Alolan Marowak

Ghost.

1. Alolan Marowak

Dragon:

1. Bagon
2. Shelgon
3. Tyrantrum

Water:

1. Relicanth

Flying:

1. Aerodactyl

Steel:

1. Steelix
2. Aron
3. Lairon
4. Aggron

Ground:

1. Geodude
2. Graveler
3. Golem
4. Onix
5. Cubone
6. Marowak
7. Rhyhorn
8. Rhydon

Rock:

1. Geodude  
2. Graveler
3. Golem
4. Onix  
5. Rhyhorn
6. Rhydon
7. Aerodactyl  
8. Sudowoodo
9. Aron  
10. Lairon
11. Aggron
12. Relicanth  
13. Bonsly
14. Tyrantrum