I give up on this raid

I can't do it, I've been playing this raid since it came out and I just can't beat Mewtwo, I came the closest today when it had 1/4th healfh left, but the problem is you can't do this solo you have to have a perfect raid with all bug tera type mews all which have the right moveset. Well I got that today with that raid the problem is no one in these raid battles knows what the phrase heal up means. We could have easily beaten this Mewtwo had they just used that but they didnt. I've been looking for hours now and I haven't gotten a raid even close to that. Not only that everyone joins and just leaves at last minute leaving only you and one other person. I can't do it I'll give it one more try and if I don't even come close I'm done I give up on Mewtwo