It depends on the starter you picked. Depending on the one you picked, you get a certain legendary dog. The dogs run from you, just like Mesprit or Cresselia in Pokemon Diamond. I can't recall off the top of my head which dog matches which starter. Glad if I helped!
Entei is one of the three legendry dogs, the other wo are suicne and raikou. They first came out in the very first Pokemon games. Entei is fire, suicine is water and raikou is electric.
to catch suicune,mewtwo,raikou and entei
You have to have leafgreen or firered trade you entei and raikou.
You get suicune,raikou,or entei depending on your starter pokemon (charmander = suicune squirtle raikou and bulbasaur entei) and you can get mewtwo in cerulean cave
You can't find them in there.
Yes Entei/Raikou/Suicune it depends on what starter you chose.
Raikou #243 Entei #244 Suicune #245 The number they have on the National Pokedex is the same as the Johto Pokedex as well.
lugia, ho-ho, suicine, articuno, zapdos, moltres, mewtwo, Kyogre OR Groudon, Raikou, Entei, and Latias
Entei, Raikou and Suicine are often referred to as the Legendary Beasts or Legendary Dog pokemon. They aren't in Diamond, so you'll have to trade or migrate them. You can do this from the following games: FireRed/LeafGreen, HeartGold/SoulSilver and OmegaRuby/AlphaSapphire.
Lugia, Ho-oh, Suicine, Entei, Raikou, Zapdos, Moltres, Articuno, MewTwo, Groundon, Rayquaza, and Latios
well u must go catch entei suicune and raikou.
mewtow zapdos moltres articuno mew entei raikou suicune