The bicycle changes nothing about how much sweet scent actually increases the RNG, it just makes it 100% consistent of a frame advance.
I believe the only reason it wasn't a consistent +2 was because the lead Pokemon (the one following the trainer) moves when using sweet scent, causing advancement. It's kinda like gen 5 where saving advances the RNG because you take a knee when saving (NPC movement).
I believe the only reason it wasn't a consistent +2 was because the lead Pokemon (the one following the trainer) moves when using sweet scent, causing advancement. It's kinda like gen 5 where saving advances the RNG because you take a knee when saving (NPC movement).