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How would you feel about this change to Z-Moves?
>If the Z-Crystal held by a Pokemon that has STAB for that type, the Z-Move gains a secondary effect.
>Z-Moves in general are debuffed if this ends up making them too broken.
For instance:
>Fire Z-move has a chance of burn
>Psychic Z-move decreases Sp. Def
>Grass Z-move replenishes 1/8 or 1/4, whichever works best, of total health
>Ground Z-move decreases Speed
>Electric Z-move increases Speed