Raihan is the last gym leader in Pokemon Sword and Shield. He was pretty memorable.
I hadn’t really paid attention, because I forgot he was the one who fought Leon at the very beginning.
I will say, his gym trial was very forgettable.
He had an interesting battle, as you can fight as a double team. He definitely was the most challenging of the boss gym leaders.
Defeating his last Pokemon gave me a run for my money.
You face him a final time during the championship before Leon. So you had two very challenging battles.