I'm thinking of adding a Nido. Do you guys think I should go for KIng or Queen. I have a snorlax with heavy slam, ice beam, thunderbolt, and rollout which can take a fair amount of hits.
In the standard competitive environment, the Nidos and Snorlax aren't that viable, sadly. The former two are outclassed by Incarnate Landorus as specially-based Ground Pokemon, since it's stronger and faster than both. Snorlax, I'm iffy on because it just keeps getting more overwhelmed by stronger attackers with each passing generation. You could use Gengar as a specially based Poison Pokemon as it has a very good movepool. I'm on my phone now so I can edit the right sets in later.