How to pair without Apple id
How do I impair an Apple Watch I don’t know the Apple ID or password to? And how do I pair it with my phone?
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If this is a used device that has someone else's Apple ID on it, you have encountered Activation Lock. The only way to remove it for you to use the Watch, the original owner who's Apple ID is on it will have to remove the Activation Lock before you can use it. If you cannot contact them, then the Watch is useless to you. You will not be able to remove the Activation Lock or pair it to your iPhone. About Activation Lock on your Apple Watch - Apple Support