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Something I never understood.
Rhydon is made of rocks. However, when he uses megahorn, it does bug type damage.
Why? If it's inherent to the attack that it's bug type, things that aren't bugs shouldn't be able to learn it. and Rhydon should learn a variant called Rock Horn.
There's a lot of other examples of this.
Snorlax can use Heavy Slam, a steel move. Even though it isn't made of steel.
Tepig can use Head Smash, a rock type move, even though its head isn't a rock.
Gyrados can use Power Whip, a grass move. Even though it's a fucking water dragon and has no relation to grass.
Like with Fire Punch, Thunder Punch etc. those make sense to be the elements they are. Because the Pokemon is actually manipulating a raw element when it uses it. But for a lot of things it doesn't make sense.