Rainmaker

The Rainmakers are Decepticons in the cartoon portionGeneration 1 continuity family.

These three Decepticons were Cybertron residents that took the form of brightly-coloured 'Season One'-style Seekers (having never gone to Earth, they retained their tetrajet alt-modes). 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 some acid rain.

Guess what? They lost.