The Voltorb Flip game is actually seeded using the game's Mersenne Twister RNG. Kaphotics did some looking at it just last night actually, to see if it had any useful applications for RNGing.
(4:13:57 AM) Kaphotics: 624 -> 16 for just starting the game
(4:14:04 AM) Kaphotics: err, loading the table at goldenrod
(4:14:46 AM) Kaphotics: god what the fuck
(4:14:59 AM) Kaphotics: it chooses to advance a frame on certain tiles
(4:16:19 AM) Kaphotics: oh I see
(4:16:41 AM) Kaphotics: if you do a risky move (high chance of being a voltorb), it checks to see if it should warn you based on the risk
(4:18:46 AM) Kaphotics: 624 -> 16 (next 17) -> 31 (next 32) -> 47 (next 48) -> 95 (next 96)
(4:18:58 AM) Kaphotics: so essentially it's NOT constant but based on the MTRNG values it gets
(4:19:04 AM) Kaphotics: it probably trashes certain ones
(4:19:31 AM) Kaphotics: tl;dr -- not worth it
We have several other ways of confirming seed\second\delay in HGSS, though. Elm calls are the most commonly used -- each time you call Elm, he gives three responses decided by the upper 16-bits of the RNG, modulus 3.