This boss fight is a lot easier than it may seem.
Evil Blob lord looks like Dr Zoidbergs evil cousin. There are 3 stages to this fight.
Stage 1: He will drop black Blobs from the sky, so just dodge these, and get the shield jelly bean ready. After this sequence ends, equipe the shield and stand just under the lowest platform. Equip the Mech jelly bean ready. Press and hold B to deflect the 2 energy balls he fires at you. Press Y to drop shield Blob and give him the Mech jelly bean. Then approach him and repeatedly press B to punch him.
Stage 2&3: Equip and give Blob the bouncy ball jelly bean. Avoid all the falling Blobs. Once this has finished, quickly bounce up to the top platform, as he will flood the screen. Equip and give Blob the shield jelly bean. Once the green goo subsides, shield up and drop to the lowest platform, and deflect them energy balls back at big ugly. Then equip and give Blob the Mech and punch his face good and hard.
The 3rd sequence was exactly the same for me, so I am assuming it's the same all round. The only difference I found was the pattern of falling Blobs can change.
After the 3rd sequence is done, he will explode and melt away. Congratulations, 150g is your, and all that's left is the closing sequence and credits.
If there is anything you think is incorrect, or fancy leaving a comment, hit me up.