>>43237415Ralts would be very sick.
Kirlia would be sick.
Gardevoir could smoke and drink but it would slowly leech its health.
Gallade could tank the health damage of smoking or alcoholism better than the average Gardevoir or human.
Being drunk has the same effect as on people, but their psychic powers become unstable. They have less control over it, and can't bring it to its full potential.
For a tipsy Gardevoir this might manifest in creating illusions or making people feel strange unexplained emotions, or objects levitating at random and falling off of tables. A completely shitfaced Gardevoir is as dangerous as a drunk driver, it can drive people to homicidal or suicidal rage, fling objects at incredibly high speed, or force someone's heart to stop beating, either by intent or by accident.
Gallade would take more alcohol to make them drunk. A tipsy Gallade is generally a fun party guy. A very drunk Gallade can get aggressive and with their blades they can easily maim or kill someone.
Ralts will just get sick with very little alcohol, potentially requiring medical intervention. Kirlia risks vomiting or passing out, but if they're very drunk they won't cause as much damage.