After you go to burned tower it will appear in the wild randomly. how you catch it is up to you (personally I would use a master ball)
you catch it by chasing it use block or meanlook if it don't run attack it then thry throwing the pokeballs you have
Yes
An easy way to do it is to have a masterball ready (or use ultra balls) and go to route 39, then keep crossing to route 38, check your pokegear and see where entei is. then when he comes near you, roam the grass and find him and catch him
no
Any pokéball
entai- legendary dog Pokemon
You have to use palpark from a GBA game(pokemon)
to get entei in crystal you need to prepare and you could find him
You can't catch Rotom in heartgold.
you cant catch him in heartgold you can only get him in soulsilver
You can't catch him in HeartGold. Only in SoulSilver. In HeartGold, you catch Kyogre in Embedded Tower. If you transfer either Kyogre or Groudon to the other game, you can catch Rayquayza
start with bulbasaur an finish the game (includeing n dex) and done