VGFacts

In Pokemon Gold and Silver, talking to a Machoke in the basement of the Goldenrod department store and then immediately checking your coin case with cause a glitch in which the game restarts with altered colours.
Because of this, the usual black silhouettes of Ho-oh or Lugia at the title screen are displayed in full colour.

http://bulbapedia.bulbagarden.net/wiki/C...e_glitches