Dear, Vector Prime.
How did Megatron and Starscream team up with Mini-Con Chop Shop and Waspinator?
Dear Bug Bearer,
Starscream and Megatron met their insectile partners after they were all plucked from their respective home dimensions to fight in the Thrilling 30 War. Neither Chop Shop nor Waspinator were Mini-Cons, however; Chop Shop was a Waruder pilot, while Waspinator was a Beast Battle Master who had been active on Earth in the 1990s. Meanwhile, Megatron and Starscream hailed from different splinters of the same timeline: Megatron during his time as a miner on Luna 1, and Starscream after successfully seizing command from Megatron during the Decepticon invasion of Earth. The two had a difficult relationship, as Starscream was forced to work with Megatron once more—a Megatron who, meanwhile, had never experienced their long history.
The only Mini-Con participants in this conflict that I recall were Suppressor, a member of the Ransack Team; and Heavytread, Runway and Windshear, a trio who were recovered by the Decepticons on Earth and who could combine to form Centuritron, a larger robot possessed of super-strength. There were diminutive bots of all kinds involved, though. The ex-gladiator Groundbuster, a Decepticon escapee of the prison ship Alchemor, was right at home in this battle royale. There was even a human participant, a very confused Valkyrie pilot. The largest warrior involved, by contrast, was Metroplex, who had been abducted mere moments after being reawakened by the Last Prime.