This is Koola's weakest form that we see. This form seems equal to Goku's regular form, while fighting him. Though, he takes out Piccolo rather easily. But to break the ice, he transforms into his 5th form.
This form is greater than Goku's regular power by far. Koola started to beat the crap out of Goku, until Goku got the anger to go Super Saiyajin. He then proceded to beat Koola around, until Koola made a Death Ball and threw it down at Goku. Goku quickly powered up and deflected it back at him, making him go into the Sun and explode.
This is the final form of Koola. When his dead ashes were traveling through space, he fused with a chip from a dead ship called the Ghetti Star. He was reformed into a metal body where he can regenerate limbs and revive his statistics. SSJ Goku and SSJ Vegeta both are too weak to defeat him, until Koola starts to suck the life out of them and their power. In this case, they both power up and start to overload the Ghetti Star, making it explode. Koola survives however, but with a bashed up body. Goku makes a tiny blast and goes into his heart chip, destroying it, along with Koola.