What if players run from interactable Pokemon?

Question

Right now I know that non-legendaries disappear forever in Emerald and Platinum, and legendaries in Emerald (not sure about Platinum) reappear when the player leave and re-enters the location. I heard that they all disappear forever in some games, or they reappear when the player defeats the champion. Please don't question my curiosity.

Comments

When I was a kid I was playing D/P and I was trying to catch Azelf. I thought it would later become a roamer because Mesprit is as well, so I ran away. Azelf never came back, ever

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I would like to answer this by replaying White or White 2, would me trying to run away from Reshiram be enough of an answer for you?

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I definitely would like that, but I don't think it would be a complete answer. While you're playing, can you try running from a non-legendary, like Darmanitan or Volcarona?

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Then what would you consider a complete answer? If someone played every main series game and tried to run away from every static Pokemon? Because that's never going to happen.

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Snorlax and Sudowoodo disappear forever if you run from their encounters (when using Squirt Bottle or playing Pokéflute on the Radio) in HG/SS. :P