Battles with more than two trainers

[Educorreia932]

The current language specification only allows for batte with two players.
However, this consequently allows only for 12 different pokémon in battle (which in turn represents 12 different variables).
A way to allow for more variables to exist would be by letting trainers having more than just 6 pokémon, but this doesn't reflect what happens in the pokémon series.
So, a more accurate solution would be to allow for more than just two trainers.