Delete Seasonal

This was the last Seasonal.
New OM Theorymon ladder it's going to take its place.
Implement OU Theorymon

This commit implements an OU theorymonged metagame with some Pokémon changes.
More info: http://www.smogon.com/forums/threads/the-ou-theorymon-project-psychic-fairy-cresselia.3499219/