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My game will have rain. And the rain actually affects the player by slowly draining his energy down.

How do i make this? Or do i use a looping image series with transparent sky but water drops falling?

You can do it with a single actor, or you can try using particles (normal actors with a little bit of code to make them act like rain). I recommend a single actor since particles effects can slow down your game, and aren't always necessary. As for slowing the player down, while the rain actor is on screen, slow them down. You should trust your own judgment a little more, test things out, and if you are still unsure ask on the forums. You'll learn a lot more that way.