need help

[Zallarion]

I have a dreamteam, and i need help with this:

houndoom - item and attack?

rhyperior - item and attack?

where do i get them exactly and how do i evolve or catch m and what is the best moveset and nature?

i really need all the details thank you very much

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i'm at the point where i need to defeat the elite four, i have just beaten the rival for the last time just before i could enter..