OM Ideas

Offensive Inversions

Atk and SpA switch

Physical moves become special
Special moves become physical
Status moves are not affected

(Code-wise) Something like

    {
        name: "Offensive Inversions",
        section: "Other Metagames",

        mods: 'offensiveinvertions',
        searchShow: false,
        ruleset: ['Pokemon', 'Standard', 'Team Preview', 'Swagger Clause', 'Baton Pass Clause'],
        banlist: ['Uber', 'Soul Dew', 'Gengarite', 'Kangaskhanite', 'Lucarionite', 'Mawilite', 'Salamencite'],
        onModifyMove: function(move, pokemon) {
            if (move.category === "Physical") {
                return move.category === "Special";
            } else if (move.category === "Special") {
                return move.category === "Physical";
            } else {
                return move.category === "Status";
            }
        }
    }

(Complete BattleScripts code)

exports.BattleScripts = {
    init: function () {
        for (var i in this.data.Pokedex) {
            this.modData('Pokedex', i).baseStats['atk'] = this.data.Pokedex[i].baseStats['spa'];
            this.modData('Pokedex', i).baseStats['spa'] = this.data.Pokedex[i].baseStats['atk'];
        }
    }
};
======================================

Defensive Inversions

Def and SpD switch

Physical and Special moves become ineffective
Status moves have a 50/50 chance of becoming physical/special
All use-able moves now have 80 base power

(Code-wise) Something like

    {
        name: "Defensive Inversions",
        section: "Other Metagames",

        mods: 'defensiveinversions',
        searchShow: false,
        ruleset: ['Pokemon', 'Standard', 'Team Preview', 'Swagger Clause', 'Baton Pass Clause'],
        banlist: ['Uber', 'Soul Dew', 'Gengarite', 'Kangaskhanite', 'Lucarionite', 'Mawilite', 'Salamencite'],
        onModifyMove: function (move, pokemon) {
            if (move.category === "Status") {
                if (Math.random(10) <= 5) {
                    return move.category === "Physical";
                }  else {
                    return move.category === "Special";
                }
                move.basePower === 80;
            } else {
                move.basePower === true;
                move.priority === 0;
                move.secondary === false;
                move.target === "self";
                move.isViable === false;
                move.boosts === false;
                move.drain === [0, 0];
            }
        }
    }

(Complete BattleScripts code)

exports.BattleScripts = {
    init: function () {
        for (var i in this.data.Pokedex) {
            this.modData('Pokedex', i).baseStats['def'] = this.data.Pokedex[i].baseStats['spd'];
            this.modData('Pokedex', i).baseStats['spd'] = this.data.Pokedex[i].baseStats['def'];
        }
    }
};