Gallien Krueger MB200 , can I gig with it?

Ditto. Depends on how loud you need to be, and how loud the guitarist and drummer are. An old Fender Rumble 60 combo was just enough for me to to be able to play with the first band I practiced with, but in another band nobody could hear me with a 500W pushing a 410 until we fired the earbleed guitarist.
 
Sure you shouldn't have any problems gigging with that setup. I've played outdoors for 2000 ppl with a 150 watt 112 Fender Bassman combo before, was heard just fine. Days of huge rigs and 1000 watts are over. PA makes even the smallest rigs gig worthy now.
 
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Sure you shouldn't have any problems gigging with that setup. I've played outdoors for 2000 ppl with a 150 watt 112 Fender Bassman combo before, was heard just fine. Days of huge rigs and 1000 watts are over. PA makes even the smallest rigs gig worthy now.
I’m taking a wild guess that he won’t be starting out with the luxury of a pro-PA/engineer/monitor setup.

and I’m taking a not-so-wild guess that, with that head and a 210 cab he won’t even be heard at a typical band rehearsal he’ll get stuck with

Imo, at minimum he needs an additional or larger cab just for starters.

I would have advised him to start with at least 400 watts and an 8-ohm 212 cab with the idea of adding another same cab.
 
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I've gigged and rehearsed with an MB200 many times, so it can be done if your band and venues will work with that volume level. The problem with talking about a typical gig or typical rehearsals is that we all have wildly varying notions of what that is. The MB200 with a 1x10" has always been enough to rehearse with for me, including with two guitarists and a drummer, but I'm not working in any of the heavier genres. I used my MB200 with a pair of 1x12" cabs in a large room with no PA reinforcement on Saturday and had enough volume (although it wasn't a rock gig), but that was at the limit of the MB200s power as I could hear the limiter working on louder passages. It's worth noting that the limiter on the MB200 is quite musical sounding, so you can get away with pushing it if you need to.
 
I’m taking a wild guess that he won’t be starting out with the luxury of a pro-PA/engineer/monitor setup.

and I’m taking a not-so-wild guess that, with that head and a 210 cab he won’t even be heard at a typical band rehearsal he’ll get stuck with

Imo, at minimum he needs an additional or larger cab just for starters.

I would have advised him to start with at least 400 watts and an 8-ohm 212 cab with the idea of adding another same cab.

My last band had a 100 watt Peavey head from the 70's and unbranded 8ohm 112,think it was a stereo speaker honestly and I never had one single issue being heard at rehearsal. I take my Fender Bassman 150 and play without pa support at my local church on occasion and it holds its own just fine with drums and a guitar player. Just speaking from my own personal experience. Most suggestions for required wattage are grossly overrated.
 
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That head and a 4 ohm 2x10 has been my gig rig since they first came out.
99% of the time I line out into the PA, but I've also kept up with a drum kit and 40W guitar tube amp with no PA support just fine. Volume never went past noon.
 
I've been gigging a MB200 with a GK CX115 for several months now. We are plugged-in acoustic folk rock play and play mostly smaller rooms. The 125 watts at 8 ohms is plenty. I've never had the volume above 2:00.

If I have no PA support in a larger room or outdoor park type setting I have a 4 ohm 2x15 JBL cab that brings the amp to 200 watts and works fine.
 
Although TB bi-laws can be somewhat restrictive, in no way are you required to seek permission to use a particular amp, instrument or any other gear set forth here with.