I'd have thought mistaking it for Electric/Dark was more likely :XBefore I caught my first Luxray/Luxio/Shinx, I used to assume it was Normal/Electric. Boy, was I confused when my Machamp's Dynamicpunch did regular damage vs Volkner's Luxray :s
Then I caught one for myself and saw that it was Pure Electric -_-'
Dynamite Punch sounds a lot more badass though if they could even fit it under the limit, if there is one.