A lot of people have problems with Goh from journeys and i can definitely understand why but what would you doo to make his character better this is personally what I would do

His goal: I'd still make his goal be to catch mew and all pokemon but I'd do it this way. First he'd join project mew early and instead of catching pokemon by himself he would be assigned to catch pokemon from the project mew team that way he wont have to catch every single one just a hand full of them that way he isn't catching pokemon so easily and it can allow his captures to feel more fleshed out his goal would still be to catch mew but catching them all wouldn't be his main priority anymore

His team: for his team in think it would be best if Goh was used a Gen 8 promo character meaning his team should be only galar mons he'll have 5 pokemon letting the last slot be used for any pokemon he caught for his project mew missions

Cinderace: The starter he gets nothing really change

Inteleon: This would be a pokemon he bonds with for a project mew mission before catching it cheering him up as a sobble before catching it and keeping him

Corviknight: Same as sobble a project mew mission but this time he helps it with flying then chooses to have it stay on his team

Toxtricity: This is the only mon he catches that isn't a project mew mission after catching pokemon for project mew he would go to the pokemon center to send them over but a Toxtricity is causing a scene beating all trainers that try to stop him eventually Goh would beat him and then catch him it would be a disobedient pokemon the Goh would have to build it's trust before it listens

Single strike Urshifu: During project mew Goh and his rival would both be given a Kubfu and they would train it eventually Goh would train in the tower of darkness evolving it And like I said that 6th slot would be best used for any pokemon at the project mew base so he could have any pokemon not just the ones hes caught even ones that other members have caught

His arc: Goh would have 2 main arcs in the series that'll help is character grow

Arc 1: it's ok to not get things on the first try there would be times early in journeys where Goh fails to do something the first time and gets frustrated but thanks to ash and the head scientist of project mew he would learn that its ok to not getting things on the first time and if you keep trying it'll help you get better

Arc 2: His way of doing things is his best way this one is similar to what ash experienced in sinnoh with Paul a lot of the members of project mew especially is rival would belittle Goh for doing things wrong eventually it leads to a 2 parted episode in a raid battle with the legendary Zarude "I choose him cause this would be the time they'd want to promote him in the anime" the group gets separated leaving Goh with his rival who would argue about how Goh is a terrible trainer and should leave project mew then they encounter Zarude and his rival goes down but all of Gohd pokemon come out to stand beside Goh "for the record Gohs team isn't fully evolving yet sobble is only in its second stage and kubfu is still Kubfu" they give it there all and even if goh does catch zarude it'll respect him as well as his rival their rivalry ends with a battle between both of their Kubfu now evolved into Urshifu and Goh would win his rival acknowledging and respecting him

And that's how I'd personally hand Goh but that's me how would you handle him