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If sun is the prevailing weather condition, the wielder's Speed stat is doubled. If the sun ends or a new weather condition is brought into play, the wielder's Speed returns to normal.
Chlorophyll is an extremely powerful tool for sun-based teams. Most Grass-type attackers may pack a punch, but they are usually terribly slow. Pokemon such as Victreebel and Tangrowth have trouble launching one of their ground-shattering attacks, due to being outsped and taken out. However, many Grass-type Pokemon with Chlorophyll still face the same problem in that their own weather condition makes their weakness to Fire-type attacks greater. Chlorophyll is an amazing ability in its own right, turning Pokemon such as Sawsbuck and Venusaur into dangerous attackers. However, the fundamental problem still lies with using the weather condition as a core for a team.
Found in Dream World