Yes.
Entei is a powerful Fire-type legendary; however, it mainly flees in Pokemon FireRed, LeafGreen, Silver, Gold, Crystal, Heartgold, and SoulSilver. It wouldn't hit your Gastly, unless Mean Look is used. You can catch Entei with any Pokemon, because it just requires at least a Poke Ball to attempt to catch it. Be careful, though, if Entei doesn't run or get caught, it can easily defeat Gastly.
fire
Entei is #244 in the national pokedex, and it is a Fire type Pokemon.
Entei because it learns eruption and fire blast! Hope that heps!
fire ones
Entei is a fire type, so it is weak to ground, water, and rock type moves.
No, you can catch Entei without catching Moltres.
I assume your talking about the first time (I caught Entei once... I'm in the Go Rock Squad base ;)) Charge your partner Pokemon and use their Static assist on the 2 magmar, it won't last so long on Entei, so capture the Magmar while they are away from Entei and hustled together. For Entei, just use a water poke assist, it will leave it at your mercy! Then circle like mad
definitely fire blast. it does 120 damage and since entei is a fire type and legendary Pokemon it probably does around 180 damage. hope this helped :)
MIGRATE IT FROM LEAFGREEN OR FIRE RED
The Legendary Beast of Fire, Entei.
Entei learns many great moves. The strongest moves that Entei learns by leveling up are Extrasensory, Fire Blast, Calm Mind, and Eruption.