Being a penguin, Adelie was once a complete stranger to the sport himself. You might even say it was alien to him originally. It took a ton of hard work and dedication to learn hockey and to get into shape to play, but it is likely Adelie would put the aliens through the same trials he went through as a penguin trying to break onto the scenes. This consists of tons of time spent in the cold, miserable, iced over land mass that Adelie calls home. They would be taught how to slide and how to glide on the ice as that is the fundamental of the sport. Once you know how to move and balance, the rest comes with time. He would then teach them how to catch yummy fishes, not because it was important to hockey, but because they'd need a snack for all the studying they'd need to do! After all Adelie would write them a very detailed guide on how to hit other players for maximum ouchies. That's the primary goal for hockey after all! Once training with Adelie was done, he'd unleash the aliens who would be absolutely brutal players thanks to his teachings!