Bowser Jr tips!
Bowser Jr is a pretty underrated character despite decently consistent tournament placing a by players such as Ketchup or TKG. One important tip is to basically always have mechakoopa out while you can. It is pretty laggy so only use it when you know you are safe. It patrols the stage and controls it very well which can be used for easier reads and predictions. Another tip/trick is catching mechakoopa mid-air. Just down b and fast fall to catch it. For the lower GSP ranks id say that dropping clown car either on ledge or just beside it is a good ledge trap. At higher GSPs people are better at punishing and/or are less afraid of dropping off ledge to avoid it. You can also air dodge past ledge using up b and hammer swing the opponent standing by ledge.