The bulk update request #13210 has been approved by @evazion.
A terribly vague tag; almost every single post on the site features a character in one pose or another. The wiki specifies it's for "artistic" poses, but every tagger is going to have a different definition of what counts as "artistic" enough and a number of them will never even read that clause. post #5675007, post #5798917, post #5548764 and post #5820085 are all tagged as pose, and none of them I'd consider unique enough to qualify.
I'd like to nuke it rather than deprecate, but pose solo -standing almost exclusively returns standing posts (almost as if some taggers are using pose as a stand-in) so it'd be a good tag gardening search.