Eviolite is a consumable "stone" that may be fed to a Pokemon to stop an evolution in progress. When a Pokémon consumes
Eviolite, it gains the hit dice and AC of the next evolved form (If greater than the current form), and gains a number of evolution
points to add to its scores as stated in its stat block, decreased by two. It retains all its current proficiencies and skills, move set,
and abilities. An Eviolite must be fed to a Pokemon at each possible evolution, so those Pokemon who have three stages of
evolution would need to consume two different Eviolites to maintain its first stage through level 20.
Joe also mentioned
I think I might remove that second caveat of Evolite as it doesn’t make sense. If you permanently halt an evolution, it doesn’t get a second chance later to evolve into a new form. It just never evolves and gets the bonuses of its next stage
The important bit is "it gains the hit dice and AC of the next evolved form" this means that we will have to track when you applied the Eviolite to your Pokemon as the HP you gain will change.
The new Eviolite description is as follows
Joe also mentioned
The important bit is "it gains the hit dice and AC of the next evolved form" this means that we will have to track when you applied the Eviolite to your Pokemon as the HP you gain will change.