@
Hameed Ziabari
No, he can ask us here too.
So, you main bowser right? There actually aren't many bowsers that I've played, but I think bowser, for being heavy, can be stringed to hell, so you need to act fast in moments like those. On the other hand, bowser is ridiculously powerful and makes KOs look easy. This makes up for his weakness.
Jiggs is lightweight, and she needs to be super careful, which is why you find it difficult to approach. They will stay patient at all times and find an open spot. Bowser has a lot of powerful moves that leaves him vulnerable after, such as fsmash, upsmash, nair, even his dash attack.
The best option is to bait it, pressure her and make walls as lagless as possible. Be patient. Use your upsmash on the ground if she tries to roll right to you, but you need to expect it. Shorthop fair? utilt that. If she attacks you, shield and punish. You can play just like jiggs can in the MU. In fact, most MUs consist of this, imo.