What do you need help for, exactly?
If you wanted Ninjask, you're going to need another Nincada, mate.
There is a confirmation box when a Poké evolves; pay attention next time, especially when you buy it to others. :3 (but at least you didn't wait for lvl 100 and then clicked "No"... It's something.)
If that's not your issue, then... I really don't get it and need more than 5 words to "describe" it
Oh ty