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Digital pokemons.
By giving an item to the pokemon you can add/replace the second type with a new one, the Digital type. No weakness, resistences or immunities. No digital type moves. Every move of your pokemon is STAB but weakness/resistence of the first type of the pokemon are doubled.
I.e. charizard gains the Digital type. So now it’s Fire/Digital. Weak to the Water 4x, resistance to grass 1/4x.
Once for battle. Some pokemon can change form too.
Idk if it’s better with an ability or not