I have 9 lucky Machamp...none with 15a, so it might not happen for a while. I did take a lucky 13a/14/15 to level 35 during one of the stardust events.
However, last week caught a level 25 100% on a non-Mewtwo day, so that’ll soon join my earlier 15a/14/15 raid catch that is at level 35. Raid them and trade them, but that 89% can be a non-maxed contributor 2590cp Machamps still get a lot done.