Rainmaker

The Rainmakers are a Decepticon subgroup from the Generation 1 continuity family.

All the colors of the rainbow, except for one...

The Decepticons known colloquially as the Rainmakers are part of Shockwave's forces on Cybertron. Each one is a Seeker with a bright, single-color paint job. (The green member, Acid Storm, did find a more exciting palette.) They retain their original Cybertronic "tetrajet" alternate modes.

As their name implies, they can make rain. Acid rain.

Fiction

Generation 1 cartoon

When a group of Autobots and Chip Chase journeyed to Cybertron to fetch a cosmotron for a wounded Optimus Prime, Megatron sent the trio to make things difficult for our heroes with a dose of acid rain.

Guess what? They failed. Divide and Conquer

Notes

• The term "rainmakers" was originally used by Bluestreak as a colloquial description of their actions. However, repeated fan usage has turned this into a widely accepted name for the group, which was eventually made official as such by Hasbro's bio for Acid Storm.

• A common piece of fanon identifies the all-yellow Rainmaker as the partially yellow Sunstorm. However, even taking into consideration the haphazard coloring typically given to generic Seekers, chances are in favour of that they are not the same guy.

• The acid rain only affected the Autobots. Chip Chase was utterly unharmed. Make of that what you will.