This was the final appearance of Misty's Goldeen in the main series, excluding the flashback in Goodbye... And Then, Setting Off! (2002).
Ash and his friends see an Entei.
Brock's Pineco evolves into a Forretress.
Brock's Onix and Ash's Phanpy are revealed to know Sandstorm and Defense Curl, respectively.
The dub title is derived from the warning phrase "enter at your own risk".