Need help with this Skill Point

Ok I found a walkthrough about "Ratchet Just Ratchet" skill point to find out how to complete that skill point inside Clank. Which says that you got to only kill the enemies with Ratchet's wrench. Which I tried to do. But with an enemy swing. Ratchet's health has gone instant. And I am wearing on Ratchet the highest armor, which is the Chameleon full complete set armor. But Ratchet still takes alot of damage from the enemies.

I tried the Electroshock complete armor set and tried thudding the ground with Ratchet's swing thud of his wrench near the enemies. But that wasn't helpful because they didn't take much damage.

So is there an easier way to complete this skill point please?

Don't use the chameleon armor. Use the stalker. To get the stalker, this is the combination: Wildfire helmet, sludge gloves, chameleon body armor and boots. With this, you can hit an enemy once then leave them to die, and rinse and repeat.