After you beat the game, it will become a roaming pokemon. It will run after the first turn, I suggest using the masterball or using a strong wobbufett.
-CrystalManiac
to get entei in crystal you need to prepare and you could find him
Tornadus roams the Unova region, like Entei and Raikou roam Johto in Gold, silver, and Crystal.
u have to find it in the wild.after u defeat the 8 gyms of crystal
Raikou and Entei Are running Pokemon in Crystal unlike suicune. If you battle in long grass hopefully 1 will appear. Caution they run as soon as you engage battle so get a Pokemon with meanlook or use a Master Ball.
no u cant, u gotta find them while their running trough johto. If uve seen them once, u can track them with ur pokedex.
Pokemon crystel version
In Pokemon Crystal.
Entei can be found in Nimbasa City in Pokemon Indigo.
entei is anywhere in johto.
Ok this is 'Poke-Master' here telling you how to get a totadile in pkmn Crystal. You trade. Then keep it! GO ENTEI
you have to send it over from an older pokemon game
What the hell is a Pokemon crystal