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Similar to Mega Evolution and Z-Moves we make up new mechanics that are similar. I'll start.
Idea One:
>Hidden Attributes
It's a new mechanic where some Pokémon can gain another type during battle, with a slight form change and or altered color pallette. Some types could be brand new, such as heavily demanded Sound type, Light type, Cosmic type, and Bird type. It could add a twist the meta and even make some shit tier Pokemon viable.
Idea Two:
>PokéArmor
Think Pokémon themed Battle armor. For example Lucario Armor will add Fighting type to the holder, Dragonite armor will add Flying, Raichu armor will add Electric, etc. Pokemon themed Battle Armors will most likely only compatible with certain Pokémon.
Or Battle Armor similar to Mewtwo's armour in 'Pokémon: The First Movie.'
Or literal battle armor based on different armors throughout history.
Or battle armor made for specific Pokémon with a slight form change. It could add additional types, or stat boosts to the Pokémon as well.