so i took a trip to unova and caught a very sweet sandile who i named Zoro, who is now a krookodile. now, ive gotten all the necessary paperwork to take him to my home reigon of Hoenn, but i know how humid hoenn can be (i live just a bit away from fallarbor town). are there any precautions i should take before bringing Zoro home?

Not particularly. Unlike quite a few ground-types, krookodile can fare just as well in humid environments as in arid ones, so long as it has a sand pit to bury itself in during particularly humid days. Additionally, be sure to give yours a dry place to rest whenever it rains, and try to wait for a few hours after a rainstorm (for conditions to dry up) before sending him back outside again.