Implement Anything Goes metagame

Anything Goes is the metagame with no bans and no clauses.
It is a Smogon Metagame, though, so it enforces both HP Percentage Mod and Endless Battle Clause.
Endless Battle Clause is deemed a tool to annoy players that leads to nowhere.
It also goes against the game philosophy and the game itself has a turn limit
that's why it's added.

There is no 'Standard Anything Goes' because its bans are always going to be
Unreleased and Illegal Pokemon, as well as cartridge limitations.
Implement Mega Rayquaza Ban for Ubers

Mega Rayquaza is banned from Ubers.
However, Rayquaza with the move Dragon Ascent is allowed.
It is thus necessary to add a mod rule, Mega Rayquaza Ban Mod,
which flags Rayquaza as not mega evolveable.
Move Anything Goes tier below LC