Why can't I trade my Gallade to Pokebank?

Question

I caught a completely legit Ralts in Pearl, leveled it up, evolved it, and transferred it to gen 5. But it says in Poke Transporter, 'Theres at least one Pokemon in the box that cant be traded' or something similar. Also, I made sure it was the only one in the box. Why can't I trade it? Is there any other way to get it to Ultra Sun?

Comments

It knows an hm move, cut. In all gens where hms exist, you are not allowed to trade/transfer any Pokemon that knows one.

Hope I helped!
Source: Experience

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I am so sorry that I didn't respond. I didn't mean to make you mad. My email is total garbage and doesn't work properly

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You need to transfer the Pokemon up to generation 5 to use Poke Transporter. You need a second DS to do this though.

Source
https://m.bulbapedia.bulbagarden.net/wiki/Pok%C3%A9_Transporter

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The question says the asker already transferred Gallade to a gen 5 game.

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oh didn't see that