How do I connect my Apple Watch to a new phone if I don’t have the Apple ID password or the other phone?
How do I connect my Apple Watch to a new phone if I don’t remember the Apple ID password or have the phone?
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How to pair your Apple Watch with a new iPhone - Apple Support
if you have issues with activation lock then
the activation lock is not really on
the watch it's a theft protection measure on apples servers
it needs to be removed
About Activation Lock on your Apple Watch - Apple Support
if you don't know your appleID
if that does not help you then you need the assistance of apple
Additional Support - Activation Lock (apple.com) and or
Get Support (apple.com) , Genius Bar Reservation and Apple Support Options - Apple