#1 Screwjob
Why not pull off a screwjob?
It is no secret that WWE needs to do something really big in order to make The Evolution PPV memorable, and while the last woman standing match between Charlotte Flair and Becky Lynch was a great step towards that, what if they went a step further and had Nikki Bella win the women's title in a screw job finish!
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Not only would that allow for WWE to instantly give the pay per view a memorable moment after weeks and weeks of sub-par build, it also gives WWE a chance to book a rematch between the two women for Survivor Series. Of course, some fans might be upset with Rousey taking her first loss in this scenario, but it won't even hurt her if done right.
For example, lets say Nikki Bella colludes with Stephanie McMahon and intentionally knocks out the referee at some point in the match. This allows The Bella Twins to use a foreign object or something else to neutralize Rousey and then Stephanie McMahon can run in for the surprise fast count and the win.
In the end, the storyline fits perfectly with Ronda Rousey's feud with Stephanie McMahon in the past, allows Rousey to lose while still looking strong and gives The Evolution pay per view a memorable moment for years to come. It even opens itself up to more rematches and maybe the possibility of Rousey and McMahon one on one.