Pokemon Chlorophyll. How do you make use of this kind of ability?

Question

Is this dependent on the game's weather(IE. Summer, Winter, Spring, Time, etc) or the move sunny day?

Answer 1

It's dependent on the move sunny day, or the ability drought. If it happens to be sunny in-game (Ex. when Groudon is freed in Pokemon Ruby) then you can also pick up on it that way.