It is pretty easy to do moltres with six. I participated in a group that did articuno with six, and it was pretty tough. I've heard articuno could be done with four. So, three top notch squads of Mon might be enough for moltres.
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I believe 4 is the minimum.
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The minimum is 3.
The people I run with can easily do it. (not me, I don't have the right mons powered up.)
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6-10, in my opinion. If you know and trust the group (all at 34+) try with 5. I did 3 today, high level group of 6 strangers, 220sec (Heatwave). A group of 13 midlevel players (fireblast) 130 seconds. Group of 15 with half noobs, half upper levels 100 seconds (overheat).
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3 is definitely OK.
2 is possible I heard.
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2 is improbable, possible but everything would have to go right
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3 is possible
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My pal showed me a reddit thread who defeated Moltres with 3 members.
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I know those guys, met them through discord a couple of weeks ago. Great group of people. Fun to raid with.
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Awesome!
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3 is possible, 6 is probably wise, at least 8 if he's got Overheat
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done 4 all with overheat was easily beaten with 7 (3 were level 37 and the rest low 30's)
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3 beasts or 4 good trainers
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3
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We did it with 4 yesterday. I had the highest level with 38; the others were at 33, 30, 30. Beat it with 10s left.
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Yesterday I did it with 5 (levels 36, 34, 32, 32, 32) pretty easily. The 36 and 34 (me) didn't have to revive our original 6.