HGSS egg abuse is no different from DPPt except...
1. There's only 1 NPC to worry about
2. Instead of Coin Flip and Journal, you use Elm Calls to verify your seed and advance it. You have to do these if you want to use Elm to verify your seed
Get Pokerus
Get to Kanto
Show him the Togepi you get from him.
And you can verify your seed based on his 3 responses. Since verifying and advancing the frame are done by the same activity, it's the best you have a 10+ target frame.
There's no need for calibration too. Since the result of Elm call may skip due to frame advancement, for example...
12 elm calls on frame 1
P,E,P,P,E,K,K,P,E,K,P,E,K
12 elm calls at frame 3, which is the possible advancement if you pick the egg quick enough
P,P,E,K,K,P,E,K,P,E,K,K,E
Hope this helped >.>