Is something wrong with the Gym Leader's Linoone (Emerald)?

I was trying to defeat the Petalburgh City Gym Leader in Emerald, and I defeated his Vigoroth, Spinda, and Slaking. I was fighting his Linoone with my Marshtomp and it used Slash. It took out my Lv.25 Marshtomp (with full HP), but it was a critical hit and Marshtomp was a low level, so I can see that. But then, I sent my Machop out (Level 31). LInoone used Headbutt. Once.MACHOP Fainted!!!It wasnota Critical hit. Keep in mind that Linoone is only Lv.29. Also, it never said that “it’s not very effective”.What happened?!?

Pleaselog inorregisterto add a comment.

There are many reasons that this couldve happened.

Your Machop could have had very low defense stats, somethnig typpical in fighting types.

Lioone could have a very high attack stat, or maybe it used a move before that raised it’s stats.

Lioone could have had STAB.

basically, its very doubtful that there was a problem with your virtual father’s Lioone.

Source1: knowlege

Source2: I battled the Lioone myself recently

Did Linoone use Belly Drum? If so, its attack will be maxed out as a result, and a STAB Headbutt is will be able to OHKO a lot of things.

The Linoone is just incredibly strong. Dont forget, this is a Gym Leader youre dealing with.