After beating your Golem, look for the following CP values. These values are those of a Golem with perfect IV's.
Golem has 211 attack, 229 defense, 160 stamina. As a Raid Boss, it has a CP of 30572.
Golem is a Rock-type and a Ground-type. It has access to the following moves:
Other viable counters
IMAGE CREDIT: The Pokémon Company