Following on from its introduction in Pokémon X & Y, Inverse Battles make a return. This time, there's a shop in Mauville City where you can find Inver who, once a day, will challenge you to Inverse Battles. These are single battles, but the battle rules are always contrary to standard. If a move is typically super effective on your Pokémon, it won't be very effective and vice versa, so you need to make sure to plan ahead if you are going to partake.
Inver uses different Pokémon every day, all being drawn from the Battle Maison's trainer pool and thus have got Max IVs and are fully EV trained. The AI also adapts to utilise the new type compatibility table efficiently.
After you have defeated Inver, he will give you an item. This item is given based upon your "score" and success in the battle. You get + 1 Point for every Super Effective hit you give, and -1 Point for every Super Effective hit against you. You will get one item out of the option for the score range. The items are as follows: