Ahh, yes.The flea-bot is, in my opinion, the hardest fight in the game. (If not harder than Crocker.) Two things I STRONGLY reccomend: Have a fully-upgraded star flinger for Timmy, and an as-much-as-you-can upgraded Remedy for Timmy. The goal is to,when the fleabotlands near you,shoot him with Timmy's star-shooter. Once he is hurt, he will jump,out of reach, and recharge. DO NOT LET THIS HAPPEN. To prevent it,jump on either side of the room and blast/hit the eardrum. It will knock the flea-bot down, where you can hit him some more. Remember to CONSTANTLY pick up yellow healing orbs and CONSTANTLY use Remedy. If you repeat this and don't let the flea-bot reheal itself, you'll soon win. Good luck!