How does it come that Bite isn't super effective on Bastiodon?

Question

So, I've been battling Byron in Pearl, and my Luxray has Bite, I used Bite on it, and it says that it's 'not very effective'. The Bastiodon already had a Chesto Berry, so I'm pretty curious how bit is not very effective.

That's all.
SeeYaLater!

Comments

Why is this flagged

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'Dunno.

Answer 1

In gen 4 dark type moves were not very effective against steel types.
Source: Learning it the hard way

Comments

Same thing goes with the Ghost type.

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Then it all  changed in gen 6

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Steel Type Pokemon had a stupid amount of resistances before Gen 6 :P