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According to Smogon:
"I did not read about this in anywhere in this topic, so I will show some facts about weather abilities.
Early in the game (around the 3rth badge) you can obtain some Hipopotas and MegaCharizard, wich means Sandstorm and Drought.
Both of them become active for only five turns.
Just found a Smooth Rock, so I tested the effectiveness of the item. It doubles the weather duration. 10 turns to go.
Even if you bring in an hipopotas, switch out and call it back to battle BEFORE the sandstorm subsides, the five/ten-turn counter does not reset.
I dont have a heat rock nor any Drizzle/Snow Warning pokemon yet. "
