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The pokemons don't have some abilities that they are supposed to have, Bagon doesn't have rock head anymore just sheer force with is supposed to it's hidden ability and shroomish don't have quick feet as a hidden ability with is supposed to become technician when it evolves to a Breloom.
I think that is a perfect idea and that it should be in the game together with the gen 4 or 5 abilities (no more than gen 5 please) because some pokemon are just not themselves without them.
Breloom for a example needs technician and poison heal.