This is just really short, and requires just a short anwser, based on preference.

What would be considered the most important or the most useful type of pokemon out of this list:

Hazer
Spiker
Cleric

Also, if you wish to know, the pokes i would use in each circumstance would be Crobat, Cacturne, and Vileplume respectively. If you want to know the other pokes I have, here: Absol, Milotic, Gardervoir, Metagross, Salamence.

Thanks