What determines the order in which gym leaders send out their Pokemon in sapphire?

Question

basically, I want to know if there's any set order or if there's some AI behind it or if it's just random.

Comments

I think their non-fainted Pokemon are in a set order. When sending out a Pokemon, they look at your Pokemon, and send out the first one of theirs that has a super effective attack. If none have any super effective attacks, then they just send out their first one.

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sumwun is correct. They've definitely got some sort of battle intelligence, but how much I have no idea. I doubt it is random.

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They send out their Pokemon in a set order.

Source: Knowledge and lots of Bulbapedia

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Converting this to a comment because it doesn't suffice as an answer unless it has clear evidence to support it.

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not sure what determines it, but i think its just the coding of the game. it would be harder to add a randomizer to an already large game for the time.