Well, Hydreigon is a dragon type, and dragon effects itself, so use a dragon type or any other type about 5 levels over it, but dragon works really well.
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Well, first defeat N from the Pokemon League, then Ghetsis heals your Pokemon and you fight him. You'll need Dragon type Pokemon or Ice type Pokemon with high level to defeat his Pokemon, because there is a really powerful Dragon type Pokemon named Hydreigon. You'll need Grass type Pokemon also to defeat his Seismitoad. Fighting type to defeat his Bisharp and Boufflant, Dark type to defeat his Cofagrigus. Hope this helps and good luck!
There is no Pokemon called Zewilous, but there is one called Zweilous. It evolves into Hydreigon at level 64.
you have to have Pokemon white but if you have black you need to trade from someone with white. you need to have completed the Pokemon league then you catch zecrom then you battle N who has Reshiram then when you defeat him you have to battle ghetsis.
Same place as white forest in Pokemon black... nowhere. Pokemon black has black city, Pokemon white has white forest.
Nowhere. you can find the Black city in pokemon black and White forest in pokemon white. YOu can't got to the white forest in pokemon black