adding opertunist

abilities.js

"opportunist": {
		desc: "When the user uses a consumable, it regenerates once",
		id: "opportunist",
		name: "Opportunist",
		onResidualOrder: 26, // Don't know what this is for
		onResidualSubOrder: 1, // This either
		onResidual: function(pokemon) {
			if (!pokemon.item) { 
			// If the pokemon does not have an Item (e.g. it got consumed) Will probably have to figure somethign out for if the pokemon didn't have an iten to start
				pokemon.setItem(pokemon.lastItem);
				this.add('-item', pokemon, pokemon.getItem(), '[from] ability: Opportunist'); // Same code from the ability harvest
			}
		},
		rating: 2,
		num: 139 // IDK if just using a random number would work here
	},