Entei is a Fire-typeLegendaryPokémon introduced in Generation II. It is known as the 'Volcano Pokémon' and is a member of the three legendary beasts resurrected by Ho-Oh along with Raikou and Suicune.
How to Obtain
Entei can be obtained anywhere, anytime.
Upon purchasing the gamepass (Other Legendaries 10x), you can go to Viridian City and talk to the guy in blue at the PokéMart and he'll give you a random level 10 legendary beast. (Raikou, Entei, or Suicune).