HPlistim,
Ok I lied about my region when I started my game.
I have like 10 copies of the games (2 are Japanese and a Japanese DS) set for different regions.
So yes I know the Archipelago, High Plains, Icy Snow, Jungle, Monsoon, Ocean, Sandstorm, Savanna, and Tundras are legal (unless you consider me lying about my region illegal.)
I try to trade for native patterns so that no one has any reason to trade me illegal pokemon.
I don't check the patterns I'm traded, Contintental, Elegant, Garden, Marine, Meadow, Modern, Polar or River.