Times are changing, and old favorites soon become outclassed. However, Kakuna still stands tall, gaining from the DS era valuable tools such as Bug Bite and Electroweb. However, its current movepool may not be viable this gen, as pokemon are becoming more powerful and bulky. All it would take is one new move to solidify Kakuna as the titan it truly is.
Shell Smash at level 15. After all, Kakuna is a cocoon shell.