>>52367818To be frank, he is past his prime in BW and in BW2 he is retired champion. During his fight with N he was depressed, heartbroken by death of his partner pokemon, relucant to actually fight shade of himself.
This is why I hope that when we finally will get Unova legends game we will not get some nebulous distant past stuff but years somewhere between PLA and now, ~50-60 years before BW. This will give us Alder at his prime, as a young trainer with his most trusted, beloved Volcarona alive.