Do roaming Pokemon change IVs and personality between encounters?

Question

Because I'm too lazy to get a Pokemon that knows Mean Look, False Swipe, and a Sleep-inducing move, I was wondering if I can (in Platinum) use a Scyther to wear down the wild Mesprit's HP through multiple encounters, and then try my luck at using a Bronzong holding a Quick Claw to Block it and use Hypnosis to put it to sleep so I can catch it. However, I'm worried about what exactly happens if the IV for HP decreases between encounters and I encounter the Mesprit with less than 1 HP. Will I encounter a glitch Pokemon?

Answer 1

No they do not

I mean come on. Not like a different Mespirit shows up every time. And also experience from a bad natured Raikou.

Source: experience

Hope this helps!

Comments

when I battled azelf, once it outspeeded my scyther, and another time it didn't, so apparently i encountered a different azelf.

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One possibility was that they were both the same speed, which means its a random chance who goes first, or maybe your scyther lost speed EVs somehow

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no, the first encounter the azelf always moved first, the second encounter my scyther always moved first.

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First encounter your scyther probably didnt have many/any speed EVs, and it gained more for the next encounter

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good point. I may need to reconsider that.