Question: things to do after beating pokemon white 2?
Answer: Battle Institute (Optional)
Pokemon World Tournament (New Tournaments)
Route 20 (Return) Cave of Being.
Castelia City (Return for Eevee Gift)
Undella Town (Return) Abyssal Ruins.
Alder's House (Return)
N's Castle.
Black City (Black 2) or White Forest (White 2) Marvelous Bridge.