After beating your Claydol, look for the following CP values. These values are those of a Claydol with perfect IV's.
Claydol has 140 attack, 236 defense, 120 stamina. As a Raid Boss, it has a CP of 13450.
Claydol is a Ground-type and a Psychic-type. It has access to the following moves:
other viable counters
For Grass-types, Exeggutor, Tangela, Victreebel, Venusaur, and Meganium are your best choices.
For Ghost-types, Banette, Gengar, and Mewtwo (with Shadow Ball) are best. Mewtwo, along with Dragonite, can provide raw damage.
Feraligatr, Lapras, Milotic, Blastoise, Walrein, Kingdra, Swampert, and Vaporeon are the best alternative Water-types. A Salamence with Hydro Pump can also be useful.
Absol, Umbreon, Sharpedo, and Houndoom are the best alternative Dark-types. Heracross & Pinsir can be used as Bug-type counters.
IMAGE CREDIT: The Pokémon Company