Bombshock with Combaticons (Powercore Combiners)

Combines well with the Iron Army set too.

Heavy Tread Powercore Combiner with Iron Army

Gun and knife taken from Universe Onslaught Headrobot upgrade kit.

Heavythread with Groundspike (Powercore Combiners)

At his core, Heavytread is a gentle soul. He enjoys the fragile beauty of Earth, appreciating it all the more because of the ease with which it could be ruined. He is glad of the power he now wields, because it gives him the ability to defend the delicate creatures he loves.

Autobot
Strength 10
Intelligence 6
Speed 5
Endurance 9
Rank 7
Courage 8
Fireblast 9
Skill 4

Steelshot with Beacon (Powercore Combiners)

With Beacon acting as his spotter, Steelshot uses his powerful cannon to pound targets up to 160km away.

Autobot
Strength 8
Intelligence 5
Speed 5
Endurance 8
Rank 6
Courage 9
Fireblast 10
Skill 8

Leadfoot with Pinpoint (Powercore Combiners)

Leadfoot gained fame among the Autobots as a first class infiltrator. Combined with Pinpoint, he becomes invisible to Decepticon sensors. His hypertuned engine gives him the speed he needs to be in and out of an enemy base before a single alarm can be tripped.

Autobot
Strength 5
Intelligence 8
Speed 9
Endurance 6
Rank 7
Courage 9
Fireblast 6
Skill 9

Windburn with Darkray (Powercore Combiners)

Windburn and Darkray manage troop movements across the battlefield, ensuring they go where they are needed most to guarantee a Decepticon victory.

Decepticon
Strength 10
Intelligence 8
Speed 6
Endurance 8
Rank 8
Courage 10
Fireblast 7
Skill 7

Darkstream with Razorbeam (Powercore Combiners)

Darkstream likes to fly close to the ground and his partner Razorbeam just makes him better at cutting dangerous maneuvers even closer.

Decepticon
Strength 5
Intelligence 8
Speed 9
Endurance 7
Rank 7
Courage 8
Fireblast 9
Skill 9

TFC Iron Army (Combaticons) with Crankcase powercore combiner

Third party transformers are just great when it comes to articulation. They make a nice add-on to an otherwise dull series.