It would be an interesting match if the UCL final could bring together Real Madrid and Manchester City because there is title fight that really brings together many great young players from each team, but this is indeed difficult to make happen.
Over the last five seasons, I think Manchester City and Real Madrid have met more than two times.Despite it not being a final, the match was really tough and very interesting. So, I believe even if they both meet in the final, I don't think it will be that special because even last season, when they met in the quarter-final, the match was not easy for either Manchester City or Real Madrid. However, both teams showed their great performance, and it was the most interesting match I watched in last season's Champions League. But the truth is that whenever they meet it always be a great fight.
But to be honest, I not really sure that there will really be chance of them meeting in the UCL final.
If both teams perform better and they do not meet in the quarter-final or semi-final, they will definitely meet in the final. So, it is very possible for both teams to meet in the final. The season that Chelsea won their last Champions League was a season almost everyone was expecting Real Madrid and Manchester City to play in the final, but in the semi-final, Real Madrid lost to Chelsea. At last, it was Manchester City and Chelsea that played in the final. But let’s see what will happen next season; maybe they will finally meet.