Weather

The sky over every outdoor zone changes on its own, and what it is doing decides which types fight best there — and which are hardest to catch. Nothing is scheduled by hand: the weather is derived from the clock, so every trainer sees the same sky in the same place at the same moment.

The eight conditions

A favoured type hits harder but is a little harder to catch; a type the weather works against does the opposite. It cuts both ways — the wild pocket monsters are favoured too, so hunting Water types in the rain is harder on both counts, not easier.

What each place can have

Weather has to make sense for where it falls. It never snows on the sea routes, it never rains on the frozen islands — it would fall as snow — and the forest canopy keeps the heat haze out.