Dark Pulse is a TM so a good majority of the Pokemon can learn it, Crawdaunt being Part-Dark type should be a good hint that it can learn it. So yes Spiritomb was using Dark Pulse.
Originally Posted by C.J. Ray
Misinterpreting my posts is not your fault, negative repping me, and getting very sensitive about my posts because you misinterpreted my posts however is your fault. Think really hard, before negative repping or making a big deal about my posts. I don't appreciate being negative repped for reasons that are a result of misinterpreting my posts.