There's a lot of past-gen mechanics missing in the Game Mechanics section.

Question

I'll write down all of the mechanics I can think of in an answer below. I know most of these mechanics were only seen in the first 3 gens, but those games are still pretty popular today.

Comments

https://www.smogon.com/articles/generation-defining-mechanics

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Thanks.

Answer 1

Gen 1

• The critical hit ratio is based on Speed
• A move's secondary effects don't occur if the target shares a type with the move used (ex. Body Slam won't paralyze a Snorlax). I'm pretty sure this occured only if the Pokemon that used the move shared a type with the target and then used a move which shares a type with the target. I'll do some more research later.
• The Special stat
• All moves have a very small chance to miss, even ones with 100% accuracy.

Gen 2

• Gen 2's DV system
• Hidden Power DVs
• Damage category pre-physical-special split
• Items were introduced

Gen 3

• Hidden Power IVs
• Abilities were introduced
• EVs were introduced