Nothing more than this, I defeated the beast, and the last save was some hours early, so I didn't reset
And this happend 2 months ago
The dog just desapear forever or he will comeback sometime?
This on Pokemon SoulSilver
If you defeat the Elite 4, they'll come back again.
Pokémon that previously could only be encountered once by static interaction or roaming are no longer unobtainable if they are defeated in battle; instead, they will respawn (usually at the same location as the first static interaction) after the player re-enters the Hall of Fame.
Source
In Pokémon HeartGold and SoulSilver, IVs, nature, and personality are determined after meeting them in the Burned Tower (Entei and Raikou,) or after leaving the Pokémon Fan Club and talking to Steven (Latias and Latios.) For any roamer defeated in battle, initiating the Champion battle in the Pokémon League will generate new values.
