I started remember something about crossover, however, it's had be in different time-line of the stories by JusSonic and Nigel5469. Here the lists that's I thought of.
~ Ace Attorney Series; Royal Battle = This is different group of the story about in Royal Battle, however, the characters involved into this story which is very same as you knew of. This Attorney had to helping around the world but lived in Ponyville, which where they're want peaceful place to live and it's where no cases could find it. The group of Attorney is called The Wright Anything Agency, it's very special group that's could noticed and sense something that's off.
~ Pokemon Crusaders! = The story involved about Cutie Mark Crusaders known as CMC, they're very boring until Flare Tiger had idea to offer if they're want explored into Pokemon's Astral Plane known as Monster Pocket Plane and they're agreed to explored. They're didn't aware that's Flare Tiger's planed for them to learning about more friendship than before. They're had to beat eight different leader of the Gyms and the legend Pokemon Master.
P.S. Please ideas for CMC with beginning of the Pokemon then grow into six different pokemon that's they're had.
~ Digimon Crusaders Adventure! = The story involved Cutie Mark Crusaders known as CMC, they're begged Flare Tiger to taken them other place where they want know more as Flare Tiger decided to taken them into Digimon World, which turned them into human in order for them get their own Digimon Partner. They're would enter the group which help each other as rescue Digimons, brought the idems that's they need for, and battle each other in order to shows who gotten better. (Just like Digimon World 3 known as Digimon World 2003).
P.S. Please ideas for CMC with Digimon Partner! Just suggest me.
P.S. If anyone had ideas for Crossover. When someone ideas was same as JusSonic or Nigel5469, I hate news for you, I must turned them down. Sorry.