Well, the more floors a dungeon has, the more Monster Houses you might run into. Therefore, I'm inclined to say Zero Isle South and Destiny Tower. They've both got 99 floors, and there's a chance of there being a Monster House on all of them but the first five. They're particularly likely to appear on floors 14, 29, 46, 64, and 86. In both dungeons, no less.
It depends who you are and what moves you know
Pokemon mystery dungeon explorers of time.
Pokemon cannot be traded in the Mystery Dungeon series.
Yes, but only in Pokemon Mystery Dungeon: Explorers of Sky.
You can occasionally see them at Giant Volcano, most often as part of a Monster House.
You can't breed Pokemon in the mystery dungeon games.
No.
Get Petrify Orbs and Spurn Orbs!!!
Most certainly pokemon mystery dungeon explorers of time!
No because Oshawott was created after Pokemon Mystery Dungeon.
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It's the Darkrai battle, as also seen in Pokemon Mystery Dungeon Explorers of Time/Darkness.