I NEED TO BITE CHUNKS OUT OF A TREE - Tumblr Posts
You know, I've been thinking about how great it would be to crossover the Great Ace Attorney and Gravity Falls. There's so many good ideas, I'd be here for hours listing them all, but here are my main things:
You could have Dipper and Mabel getting chased through time by Wax Holmes (somehow, don't question it) and end up in Victorian London. Sherlock Holmes vs Sherlock Holmes is the main idea here
Sherlock ends up stuck in 2012 and immediately realizes Stan is lying about everything
Ryu, Susato, and Sherlock visit the future and Dipper realizes that Sherlock is lying about Kazuma
Sherlock and Mabel as a dynamic. The world is no longer safe
Sherlock and Ford in the same room. Would they be best friends or instantly get into a fist fight? Who knows!
Sherlock realizes that Old Man McGucket is actually suffering and not some crazy old guy
But my favorite?
If there was any mind that Bill would target to build him a portal, it would be Sherlock. No question. He's capable of making holograms, for God's sake.
But just one problem: Sherlock is far too smart to trick. So how do you do it? How do you get a man so clever to do your bidding?
Simple.

You make him.
Okay I wanted to end it there but I had some ideas for the Bill thing specifically, sooo... yeah. No dramatic cliffhanger, I guess.
Obviously, Sherlock can't defeat Bill forever. He won't be stopped for another hundred years, so how does Bill punish Sherlock for winning?
My idea? Bill erases Sherlock and his friends from all memory. As in, nobody remembers that Sherlock was anything more than a story. He shall not be remembered as a real man with real exploits, just an idea in some crazy guy's head. And his friends suffer the same. No matter how much Iris Watson or Barok van Zieks or Ryuunosuke Naruhodou accomplish, no one will ever know they existed. Their achievements are associated with someone else, and they are forgotten.
Up until 2012, where Bill is defeated once and for all, and the curse is lifted. The world blinks, and names reappear in the history books. Franziska von Karma stares in amazement at the old case record she's studying as information corrects itself on the page. Statues appear at the historic Crown Court building in London. Every copy of Sherlock Holmes fixes the name of the author.
And, well. Gravity Falls is already filled with ghosts. It's not hard for Sherlock and Co. to drop by the Pines family and offer their thanks.