Oh-- Then it might be... Uh, shit. I have to look this up.

[Jean rifled through his bag for his trainer's manual, and then did a couple of searches on the Gear. Armin has taught him well on how to use his resources here.]

Okay. Sneasel is Ice and Dark type. Machoke is Fighting type. If this thing's correct, that means that Sneasel is... 4x weak to a Machoke. Maybe he was intimidated.