Ok, not even in Pokemon Emerald back in the day did I ever one-shot Brawly's Makuhita. My Sylveon alone crushed his 2 fighting types.
Also, another thing of note about the Pokemon Radar and "sneaking", the more you encounter/fight the pokemon, the radar detection goes higher in level. With the higher level detection, it will tell you everything about it's potential, level, egg move if any, etc.
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