Round Robin: Timewarp
A certain scientist named Dr Emmet Brown's time-travel expiraments have accidentally created a timewarp from year 3000 to year 2005. (One wonders how, he went to neither of those years during the Back to the Future series) Yiachi monsters have poured into 2005. They are mysteriously drawn to their normal selves and want to destroy them. (They haven't realized that it would kill them if they kill themselves in 2005).
1. Your Yiachi monster will seek out your normal monster. You can band with other monsters to battle your Yiachi counterparts.
2. If you don't have a Yiachi Monster, you can get one now.
Originally Posted by TV Tropes
Only Ms. Frizzle could get away with putting children in mortal danger on the inside of a magical school bus. And this is why she is awesome.