Pokeverse vs. YuGiOhverse
Because this had to be made.
Each side is an army-like team. Everyone from the Pokeverse is in this fight and everyone from the YuGiOhverse is in this fight. The duel monsters are physical btw.
The battlefield is a single flat plane infinite in all directions. It has the same consistency as dirt.
The goal in this fight is total annihilation. Last army with so much as a single person (or creature, whichever) remaining wins the war.