There are two parts of the Pinwheel Forest:Outer part and the
inner part.
Pokemon in the Outer part(grass patches):
Pidove-30% chance
Timburr-20% chance
Tympole-40% chance
Throh-10% chance
Sawk-10% chance
Rustling Grass in Outer Part:
Audino-95% chance
Throh-5% chance
Sawk-5% chance
Dark Grass in Outer part:
Pidove-30% chance
Timburr-20% chance
Tympole;40% chance
Throh:10% chance
Sawk-10% chance
Now to the Inner part(grass patches):
Venipede-20% chance
Sewaddle-40% chance
Pidove-10% chance
Cottonee(Pokemon Black ONLY)-30% chance
Petlil(Pokemon White ONLY)-30% chance
Rustling Grass(Inner):
Audino-65% chance
Pansage-10% chance
Pansear-10% chance
Panpour-10% chance
Whimsicott-(pokemon black ONLY)-5% chance
Lilligant(pokemon white ONLY)-5% chance
Dark Grass(Inner part):
Tranquill-10% chance
Swadloon-40% chance
Whirlipede-10% chance
Cottonee(Black ONLY)-40% chance
Petlil(White ONLY)-40% chance