It is because there is different amounts of cloud in different areas, thus the amount of precipitation is different.
From,
Anomynous
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no
arteries carry blood away from the heart toward the organs which end in terminal branches called capillaries.
15.32 (A+)
True. Arteries are responsible for bringing oxygenated blood to the body. The smooth muscle surrounding the arteries can expand or contract causing more or less blood to flow through to the organs.
You can't. The Old Château is in the Sinnoh Region. Only Johto and Kanto are accessible in Pokemon HeartGold (which is the most amount of regions so far!)