Board Thread:Off-topic Discussion/@comment-4972558-20190524135347/@comment-5932670-20190602171934

I think when they were designing Alder and what Pokémon he could have, but they thought the new pseudo legendary didn’t suit him well and decided to give him Volcanora instead of Hydreigon, which went to Ghetsis instead to make up for it, made sense since he was the final trainer you faced in BW.