I've suggested this on the Discord and I had a positive amount of likes, so which I hope this would be added. I think we should have a progress whether we want to buy/sell from the Mystery Man. Like how before we delete a pokemon, it ask if we're sure to do that, same with evolving a pokemon. The reason for this is because some people (like me) have a magic mouse which its sensitivity is high. Personal Experience: I had wasted about 300 tokens by now, accidentally buying stones. So I hope this will be taken into consideration. Help save people's tokens.
I have also lost money, stones, and tokens by accidentally right clicking instead of left clicking or left clicking instead of right-clicking. I think it would be great to add a 2 step system.