Depends on if you're going for more of a first coming Brock moveset or a current one. I use the Brock Lock as one of his finishers because I prefer an '02 moveset – setting it up that way also allows you to give Brock two standing finishers.
Why pick only one though? you could always make something of a hybrid moveset and give him the Kimura as a groggy, chain or punch reversal submission.
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