How to obtain: After you unlock this pokemon in the burned tower with raikou and entei and save the director in team rocket invaded the radio tower event, the director will give you the clear bell. Go to Tin Tower in Ecruteak city, there are 3 guardians that you will face in the Tin Tower. Beat the 3 guardians and they will let you enter the Tin Tower and see Suicune.
Type: Electric, Fire
How to obtain: Go to burned tower and beat your rival silver and the whole will appear under you and you will see the 3 legendary dogs and unlock them. Raikou and Entei will roam in all parts of Johto.
Required HM: Rocksmash
How to obtain: Go to pewter city and talk to the old man beside the pokemart and he will give you the silver wing. Then go to whirl island near ciannwood. go inside the cave of whirl island. You can find there Lugia.
Required HM: Surf, Whirlpool, Flash
How to obtain: After you capture the three legendary dogs (Raikou, Entei and Suicune), go find Eusine (he is located in pokemon center at Celadon City) and talk to him. Then, he will go out of the pokemon center. Go to Ecruteak City in Johto and enter Tin Tower. Talk to the monk in the middle and he will give you Rainbow Wing. Automatically, a stair will appear and enter there. Go to the top and you will see Ho-oh at the roof top of Tin Tower.