Acid Man is both a genius scientist and champion swimmer. But neither one of those things will matter much after smacking him around with the Block Dropper.
At the start of the match, Acid Man activates his Acid Barrier. Use this opportunity to use the Power Gear-boosted Block Dropper.
The Block Dropper stuns Acid Man, allowing for a follow-up attack.
His secondary attack involves jumping toward you, and then shooting three corrosive bullets in your direction. Jump out of the way, then hit him again with the Block Dropper.
Once he’s sustained nearly 50% damage to his health, Acid Man triggers his Speed Gear and dives underwater. Jump over the wave and quickly fire the Block Dropper at the end of the room (in the direction Acid Man is swimming). He will jump up to shoot at you and take damage.
Assuming you don’t kill him during his four laps, the Speed Gear powers down and he restarts his normal attack cycles, making it very easy to finish him off.
If you run out of Block Dropper energy and need to use your Mega Buster, you’ll have to whittle his Acid Barrier away before you can damage him directly. It has 18 hit points; the equivalent of three Charge Shots, or nine standard Mega Buster shots.
Achievement/Trophy
No Experiments!
Reach the boss without letting any pools change. (Excludes Challenge Mode)
Achievement/Trophy
Fight Acid with Acid!
Enter a green acid pool using Acid Barrier. (Excludes Challenge Mode)