Question

For example:

A Gyarados with Bite?!
A Nidoking with Double Kick!
A Mamoswine with Peck?!
A Dugtrio with Astonish?!

I really don't know why this is, so is there even a reason?

Answer 1

In the early stages of any Battle Factory, the Pokemon they give you have horrible Movesets to make the earlier stages more challenging for you(As the AI are weak). As you get to the 2nd and 3rd Runthrough, the Movesets get better.

Comments

There was a Golem that really was quite Powerful in the early stages in HG/SS....

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Traded. Or you're scamming me.

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There are some powerful ones... and some not so powerful ones. As Holy Name* said, it gets better in the 2nd and 3rd runthrough.