Could Kabu Actually Become Champion?

Can I beat Pokemon Sword playing as Gym Leader Kabu from Diamond and Pearl? Does he have what it takes to actually become Champion?

More of "Can X Become Champion":
Marnie:    • Can You Beat Pokemon Shield as Marnie?  
Hop:    • Can Hop Actually Become Champion?  
Bede:    • Can Bede Actually Become Champion?  
Raihan:    • Could Raihan Actually Become Champion?  
Leon:    • Could Leon Actually Become Champion?  
Piers:    • Can Piers Actually Become Champion?  
Allister:    • Could Allister Actually Become Champion?  
Nessa:    • Could Nessa Actually Become Champion?  
Kabu:    • Could Kabu Actually Become Champion?  
Cynthia:    • Could Cynthia Become Champion in Gala...  
Avery:    • Could Avery Actually Become Champion?  
Klara:    • Could Klara Actually Become Champion?  

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