Growlithe. Platinum. Had the unbelievable worst luck ever and had not seen another one before then, even when my girl got a shiny wurmple on emereld AND then a shiny makuhita, on ruby. Loved that growlithe. Raised it to an arcanine, raised to lvl 100. Leant it my friend so he could use it to quick train some pokemon, you know how it is. Found out he'd restarted his pokemon game with my shiny arcanine on it. I still haven't forgiven him.