I used mean look. 1 second later "The wild RAIKOU fled!" ??? I USED MEAN LOOK.
If the Pokemon you're using is a lev9 Gastly then I'm definately certain that its speed stat is much lower than Raikou's therefore it is able to move first and flee's before gastly can attack.
It must be a glitch because roaming Pokemon cannot flee from the battle if mean look has been used on them. So its a glitch.
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