What are all the unique properties of a critical hit?

Question

I know it deals double damage and bypasses screens but what else is there to it? Also what abilities and items interact with critical hits? (like sniper, battle armor and scope lens)

Comments

Not a full answer, but https://bulbapedia.bulbagarden.net/wiki/Critical_hit

Answer 1

You didn't copy paste a bunch of text from the Bulbapedia article, so I did it for you.

In gen 1, a critical hit's damage multiplier depends on the attacker's level and can be between 1.5 and 2. They also ignore all stat changes.

In gen 2, critical hits ignore stat changes, burns, and screens, unless the user's attack stat is raised to a higher stage than the target's defense stat.

In gen 3 onward, critical hits always ignore the attacker's negative stat changes, the target's positive stat changes, and screens.

Sniper raises damage done by critical hits. Galarian Farfetch'd can evolve into Sirfetch'd after landing 3 critical hits in one battle.

These mechanics raise the chance of a critical hit:
focus energy
laser focus
dragon cheer
Z-foresight, Z-sleep talk, Z-tailwind, Z-accupressure, Z-heart swap
Gmax chi strike
dire hit
scope lens
lucky punch
stick
razor claw
Lansat berry
super luck
merciless

These mechanics prevent critical hits:
lucky chant
shell armor
battle armor
source