While many Pokémon receive specific traits when you capture them, there are some Pokémon that have hidden attributes. These attributes are based upon their abilities within the main game and completely revolutionise the way you use the Pokémon. These traits are all passive and do not show up in any part of the game, other than when they are activated.
Only a handful of Pokémon have these hidden attributes, and you cannot change them, but they can be very useful in the decision of what Pokémon to use on certain stages.
||Shedinja||White Ruins - Area 4
Cannot be damaged by moves that aren't Super Effective.
||Primal Kyogre||Sapphire Sea - Sea of Origin
Fire-type moves against this Pokémon do no damage
||Primal Groudon||Ruby Volcano - Smoldering Caldera
Water-type moves against this Pokémon do no damage
||Mega Rayquaza||Legend Terrain - Area 4
Removes Super Effective damage from moves Super Effective against Flying-type Pokémon
||Regigigas||Origin Hideaway - Super-Aura Test Lab
Halves Regigigas' Attack & Speed until it has defeated 10 Pokémon on each floor