Inform him that you are unable to attend the wedding, as others have stated. The reason behind it is yours to decide on, but don't mention the bride and your dislike for her.
Additionally, I would allow him to make the mistake of marrying her without attempting to interfere. You have been in irregular contact over the years, and he is not going to cancel the wedding or seriously contemplate any negativity from you towards it. If anything, it will push him further away. It's entirely possible that they will be a great couple; you had a very brief meeting with her that may have simply led to a poor first impression.
Let him handle this as he wishes, it's not your place to dissuade him under these circumstances.
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