By pact, I'm assuming you're just meaning teaming up with someone before a battle to, for example, take out a stronger opponent that you doubt you'd be able to tackle on your own? Just to clarify

If so, I can only really remember doing it one time in the past (there may have been other times) but it didn't work too well as the robot I'd made the pact with was sent OOTA accidentally by my robot and I then had to beat the other robot myself

But it's not something I generally look to do before every fight. In my opinion, if a robot is moving in the arena that isn't mine (or a tag partner) then it's a threat and therefore fair game. If I attack it and lose/get smashed to bits, then fair enough. Just lets me know I need to make my robot better.

The fact you've brought it up probably means if I ask, or am asked, about it in future, I'll be more aware of it rather than not giving it much thought. You're right, things are fairer and truer without pacts.