Unknown issue - Please help!

I don’t really know if anyone else is having this problem, but I am in desperate need of help. I have this dino model that when put in anything but resting pose will freak out for no reason! Please help! I don’t know what to call this problem so therefore I could not find any other similar problems

https://drive.google.com/file/d/1Kdn91I9fSfWVw7DPOvv_2frr7Zu1Dzpf/view?usp=sharing

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Your model has a crazy amount of faces, maybe bake it, create a low-poly version (retopology), then reparent it