You think you're insane to try to defeat the protopet without the RYNO 2 So do I! But I'm here to tell you how to defeat him on a budget.
You will need
Synthenoids (optional)
Plasma storm
Bouncer
Shield charger
And lots of health
Method:
1.You swingshot into the arena and he rolls into a ball,attack with bouncer
2.When the box of ammo comes along PICK IT UP!
3.When the Protopet starts shooting the mini protopets use the Plasma storm to make sure none get out
4.After a while (When you've got his health down to about 75% or so he'll start bouncing trying to destroy the floor
4.5If you see the mini tractor beam bomb and he's bouncing use it and make it explode on him!This will stop him from bouncing to destroy the floor (Not necessary)
5.Repeat steps 2-4 and you're going to totally PWN the Protopet!! Good Luck
I tested this and found this out,credits to me